18990931027 has 2 divisors, whose sum is σ = 18990931028. Its totient is φ = 18990931026.

The previous prime is 18990930997. The next prime is 18990931109. The reversal of 18990931027 is 72013909981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18990931027 - 2⁷ = 18990930899 is a prime.

It is a super-2 number, since 2×18990931027² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18990931627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9495465513 + 9495465514.

It is an arithmetic number, because the mean of its divisors is an integer number (9495465514).

Almost surely, 2^18990931027 is an apocalyptic number.

18990931027 is a deficient number, since it is larger than the sum of its proper divisors (1).

18990931027 is an equidigital number, since it uses as much as digits as its factorization.

18990931027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The spelling of 18990931027 in words is "eighteen billion, nine hundred ninety million, nine hundred thirty-one thousand, twenty-seven".