18093931 has 2 divisors, whose sum is σ = 18093932. Its totient is φ = 18093930.

The previous prime is 18093827. The next prime is 18093937. The reversal of 18093931 is 13939081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18093931 - 2¹¹ = 18091883 is a prime.

It is a super-2 number, since 2×18093931² = 654780678065522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18093937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9046965 + 9046966.

It is an arithmetic number, because the mean of its divisors is an integer number (9046966).

Almost surely, 2^18093931 is an apocalyptic number.

18093931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18093931 is an equidigital number, since it uses as much as digits as its factorization.

18093931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 18093931 is about 4253.6961574612. The cubic root of 18093931 is about 262.5292170049.

The spelling of 18093931 in words is "eighteen million, ninety-three thousand, nine hundred thirty-one".