18931027 has 2 divisors, whose sum is σ = 18931028. Its totient is φ = 18931026.

The previous prime is 18931019. The next prime is 18931039. The reversal of 18931027 is 72013981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18931027 - 2³ = 18931019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18931027.

It is not a weakly prime, because it can be changed into another prime (18931127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9465513 + 9465514.

It is an arithmetic number, because the mean of its divisors is an integer number (9465514).

Almost surely, 2^18931027 is an apocalyptic number.

18931027 is a deficient number, since it is larger than the sum of its proper divisors (1).

18931027 is an equidigital number, since it uses as much as digits as its factorization.

18931027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 18931027 is about 4350.9800045507. The cubic root of 18931027 is about 266.5168827239.

The spelling of 18931027 in words is "eighteen million, nine hundred thirty-one thousand, twenty-seven".