18870915231 has 72 divisors (see below), whose sum is σ = 32787151488. Its totient is φ = 10417680000.

The previous prime is 18870915221. The next prime is 18870915233. The reversal of 18870915231 is 13251907881.

It is not a de Polignac number, because 18870915231 - 2⁷ = 18870915103 is a prime.

It is a super-2 number, since 2×18870915231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870915233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14504281 + ... + 14505581.

It is an arithmetic number, because the mean of its divisors is an integer number (455377104).

Almost surely, 2^18870915231 is an apocalyptic number.

18870915231 is a deficient number, since it is larger than the sum of its proper divisors (13916236257).

18870915231 is a wasteful number, since it uses less digits than its factorization.

18870915231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 18870915231 in words is "eighteen billion, eight hundred seventy million, nine hundred fifteen thousand, two hundred thirty-one".