18930931 has 2 divisors, whose sum is σ = 18930932. Its totient is φ = 18930930.

The previous prime is 18930907. The next prime is 18930949. The reversal of 18930931 is 13903981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18930931 - 2⁷ = 18930803 is a prime.

It is a super-2 number, since 2×18930931² = 716760297053522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18930991) 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, 9465465 + 9465466.

It is an arithmetic number, because the mean of its divisors is an integer number (9465466).

Almost surely, 2^18930931 is an apocalyptic number.

18930931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18930931 is an equidigital number, since it uses as much as digits as its factorization.

18930931 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18930931 is about 4350.9689725393. The cubic root of 18930931 is about 266.5164322172.

The spelling of 18930931 in words is "eighteen million, nine hundred thirty thousand, nine hundred thirty-one".