18969494831 has 16 divisors (see below), whose sum is σ = 22151162880. Its totient is φ = 15906089760.

The previous prime is 18969494821. The next prime is 18969494833. The reversal of 18969494831 is 13849496981.

It is a cyclic number.

It is not a de Polignac number, because 18969494831 - 2⁶ = 18969494767 is a prime.

It is a super-2 number, since 2×18969494831² (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 (18969494833) 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, 747176 + ... + 772146.

It is an arithmetic number, because the mean of its divisors is an integer number (1384447680).

Almost surely, 2^18969494831 is an apocalyptic number.

18969494831 is a deficient number, since it is larger than the sum of its proper divisors (3181668049).

18969494831 is a wasteful number, since it uses less digits than its factorization.

18969494831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27334.

The product of its digits is 13436928, while the sum is 62.

The spelling of 18969494831 in words is "eighteen billion, nine hundred sixty-nine million, four hundred ninety-four thousand, eight hundred thirty-one".