18391679031 has 32 divisors (see below), whose sum is σ = 27174389760. Its totient is φ = 10971417600.

The previous prime is 18391679029. The next prime is 18391679063. The reversal of 18391679031 is 13097619381.

It is not a de Polignac number, because 18391679031 - 2¹ = 18391679029 is a prime.

It is a super-2 number, since 2×18391679031² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18391679011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 640911 + ... + 668991.

It is an arithmetic number, because the mean of its divisors is an integer number (849199680).

Almost surely, 2^18391679031 is an apocalyptic number.

18391679031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18391679031 is a deficient number, since it is larger than the sum of its proper divisors (8782710729).

18391679031 is a wasteful number, since it uses less digits than its factorization.

18391679031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28407.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 18391679031 in words is "eighteen billion, three hundred ninety-one million, six hundred seventy-nine thousand, thirty-one".