31315

31315 is a prime number. It is the 3353rd prime number. It is also an emirp, meaning it is a prime number that results in a different prime when its decimal representation is reversed. The reverse of 31315 is 51313, which is also a prime number. 31315 is the 231st emirp.

In mathematics, prime numbers are natural numbers greater than 1 that have no positive divisors other than 1 and themselves. The study of prime numbers is a fundamental part of number theory. Emirps are a subset of prime numbers with the additional property of remaining prime when reversed.

The sequence of emirps begins with 13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 313, 337, 347, 359, 389, 701, 709, 733, 739, 743, 751, 761, 769, 907, 937, 941, 953, 967, 971, 983, 991, 1009, 1021, 1031, 1033, 1049, 1051, 1061, 1063, 1069, 1091, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1193, 1199, 1201, 1213, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, 1427, 1429, 1433, 1439, 1451, 1453, 1459, 1471, 1481, 1487, 1489, 1493, 1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601, 1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, 1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783, 1787, 1789, 1801, 1811, 1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, 1933, 1949, 1979, 1987, 1993, 1997, 1999, 31315 is not a commonly referenced number outside of its mathematical properties as a prime and emirp.