168097931 has 2 divisors, whose sum is σ = 168097932. Its totient is φ = 168097930.

The previous prime is 168097913. The next prime is 168097981. The reversal of 168097931 is 139790861.

Together with previous prime (168097913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168097931 is a prime.

It is a super-2 number, since 2×168097931² = 56513828812961522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168097981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84048965 + 84048966.

It is an arithmetic number, because the mean of its divisors is an integer number (84048966).

Almost surely, 2^168097931 is an apocalyptic number.

168097931 is a deficient number, since it is larger than the sum of its proper divisors (1).

168097931 is an equidigital number, since it uses as much as digits as its factorization.

168097931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 168097931 is about 12965.2586167805. The cubic root of 168097931 is about 551.8920304039.

The spelling of 168097931 in words is "one hundred sixty-eight million, ninety-seven thousand, nine hundred thirty-one".