18037931 has 2 divisors, whose sum is σ = 18037932. Its totient is φ = 18037930.

The previous prime is 18037927. The next prime is 18037933. The reversal of 18037931 is 13973081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18037931 - 2² = 18037927 is a prime.

It is a super-2 number, since 2×18037931² = 650733909521522, which contains 22 as substring.

Together with 18037933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18037933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9018965 + 9018966.

It is an arithmetic number, because the mean of its divisors is an integer number (9018966).

Almost surely, 2^18037931 is an apocalyptic number.

18037931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18037931 is an equidigital number, since it uses as much as digits as its factorization.

18037931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18037931 is about 4247.1085458227. The cubic root of 18037931 is about 262.2580979342.

The spelling of 18037931 in words is "eighteen million, thirty-seven thousand, nine hundred thirty-one".