18817038231 has 16 divisors (see below), whose sum is σ = 26538867456. Its totient is φ = 11834894016.

The previous prime is 18817038199. The next prime is 18817038259. The reversal of 18817038231 is 13283071881.

It is not a de Polignac number, because 18817038231 - 2⁵ = 18817038199 is a prime.

It is a super-2 number, since 2×18817038231² (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 (18817038731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1862845 + ... + 1872918.

It is an arithmetic number, because the mean of its divisors is an integer number (1658679216).

Almost surely, 2^18817038231 is an apocalyptic number.

18817038231 is a deficient number, since it is larger than the sum of its proper divisors (7721829225).

18817038231 is a wasteful number, since it uses less digits than its factorization.

18817038231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735862.

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 18817038231 in words is "eighteen billion, eight hundred seventeen million, thirty-eight thousand, two hundred thirty-one".