31661

31661 is a natural number that follows 31660 and precedes 31662. It is an odd composite number.

The prime factorization of 31661 is 31661 = 7 × 4523, where 4523 is a prime number. Because it is the product of two distinct primes, 31661 is a semiprime and is square-free, having exactly four positive divisors: 1, 7, 4523, and 31661.

In terms of basic arithmetic properties, 31661 is not a prime and is not a perfect power. Its totient function value is φ(31661) = (7 − 1) × (4523 − 1) = 6 × 4522 = 27132, reflecting its status as the product of two distinct primes.

From a numerical perspective, 31661 is a five-digit, odd number. It is congruent to 2 modulo 3 and 1 modulo 5, and it is congruent to 8 modulo 9. Its divisors are limited to the trivial pair and the number itself, which is typical for semiprimes of this size.

In mathematical contexts, 31661 serves as a straightforward example of a semiprime with relatively small constituent primes, illustrating properties such as divisor count, totient, and factorization. It does not hold any widely known special named significance beyond its role as a representative composite of the form p × q.