18906529831 has 4 divisors (see below), whose sum is σ = 21607462672. Its totient is φ = 16205596992.

The previous prime is 18906529813. The next prime is 18906529843. The reversal of 18906529831 is 13892560981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18906529831 - 2²⁵ = 18872975399 is a prime.

It is a super-2 number, since 2×18906529831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18906529801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350466410 + ... + 1350466423.

It is an arithmetic number, because the mean of its divisors is an integer number (5401865668).

Almost surely, 2^18906529831 is an apocalyptic number.

18906529831 is a deficient number, since it is larger than the sum of its proper divisors (2700932841).

18906529831 is an equidigital number, since it uses as much as digits as its factorization.

18906529831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700932840.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 18906529831 in words is "eighteen billion, nine hundred six million, five hundred twenty-nine thousand, eight hundred thirty-one".