168931 has 4 divisors (see below), whose sum is σ = 193072. Its totient is φ = 144792.

The previous prime is 168913. The next prime is 168937. The reversal of 168931 is 139861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168931 - 2⁵ = 168899 is a prime.

It is a super-2 number, since 2×168931² = 57075365522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12060 + ... + 12073.

It is an arithmetic number, because the mean of its divisors is an integer number (48268).

2¹⁶⁸⁹³¹ is an apocalyptic number.

168931 is a deficient number, since it is larger than the sum of its proper divisors (24141).

168931 is an equidigital number, since it uses as much as digits as its factorization.

168931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24140.

The product of its digits is 1296, while the sum is 28.

The square root of 168931 is about 411.0121652701. The cubic root of 168931 is about 55.2802227444.

The spelling of 168931 in words is "one hundred sixty-eight thousand, nine hundred thirty-one".