18097931 has 2 divisors, whose sum is σ = 18097932. Its totient is φ = 18097930.

The previous prime is 18097927. The next prime is 18097991. The reversal of 18097931 is 13979081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18097931 - 2² = 18097927 is a prime.

It is a super-2 number, since 2×18097931² = 655070212961522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18097991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9048965 + 9048966.

It is an arithmetic number, because the mean of its divisors is an integer number (9048966).

Almost surely, 2^18097931 is an apocalyptic number.

18097931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18097931 is an equidigital number, since it uses as much as digits as its factorization.

18097931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 18097931 is about 4254.1663108064. The cubic root of 18097931 is about 262.5485612351.

The spelling of 18097931 in words is "eighteen million, ninety-seven thousand, nine hundred thirty-one".