90431123531 has 16 divisors (see below), whose sum is σ = 103603864320. Its totient is φ = 77322023520.

The previous prime is 90431123473. The next prime is 90431123579. The reversal of 90431123531 is 13532113409.

It is not a de Polignac number, because 90431123531 - 2²⁶ = 90364014667 is a prime.

It is a super-2 number, since 2×90431123531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90431123591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11912285 + ... + 11919873.

It is an arithmetic number, because the mean of its divisors is an integer number (6475241520).

Almost surely, 2^90431123531 is an apocalyptic number.

90431123531 is a deficient number, since it is larger than the sum of its proper divisors (13172740789).

90431123531 is a wasteful number, since it uses less digits than its factorization.

90431123531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11554.

The product of its (nonzero) digits is 9720, while the sum is 32.

The spelling of 90431123531 in words is "ninety billion, four hundred thirty-one million, one hundred twenty-three thousand, five hundred thirty-one".