16531845231 has 32 divisors (see below), whose sum is σ = 24620504832. Its totient is φ = 9780341760.

The previous prime is 16531845193. The next prime is 16531845251. The reversal of 16531845231 is 13254813561.

It is not a de Polignac number, because 16531845231 - 2¹³ = 16531837039 is a prime.

It is a super-2 number, since 2×16531845231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16531845231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16531845251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3677221 + ... + 3681713.

It is an arithmetic number, because the mean of its divisors is an integer number (769390776).

Almost surely, 2^16531845231 is an apocalyptic number.

16531845231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16531845231 is a deficient number, since it is larger than the sum of its proper divisors (8088659601).

16531845231 is a wasteful number, since it uses less digits than its factorization.

16531845231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143.

The product of its digits is 86400, while the sum is 39.

The spelling of 16531845231 in words is "sixteen billion, five hundred thirty-one million, eight hundred forty-five thousand, two hundred thirty-one".