31355

31355 is a positive integer that follows 31354 and precedes 31356. In standard notation it is an odd, composite number and a semiprime: its prime factorization is 5 × 6271, with 6271 a prime. Its positive divisors are 1, 5, 6271 and 31355; the sum of all divisors is 37,632, and the sum of proper divisors is 6,277, so 31355 is a deficient number (proper divisor sum less than the number).

Arithmetic functions for 31355 include Euler’s totient φ(31355) = (5 − 1)(6271 − 1) = 25,080, and the number of divisors τ(31355) = 4. The digit sum in base ten is 3 + 1 + 3 + 5 + 5 = 17. In other common positional bases, 31355 is represented in binary as 111101001111011 and in hexadecimal as 0x7A7B.

As an integer it does not exhibit notable special forms (such as being a perfect power, factorial, triangular, or highly composite number) and has no widely recognized mathematical or cultural significance beyond its arithmetic properties. It is one of the many five-digit semiprimes occurring in the sequence of natural numbers.