90591393431 has 16 divisors (see below), whose sum is σ = 112959560448. Its totient is φ = 70581667200.

The previous prime is 90591393371. The next prime is 90591393461. The reversal of 90591393431 is 13439319509.

It is a happy number.

It is not a de Polignac number, because 90591393431 - 2²² = 90587199127 is a prime.

It is a super-2 number, since 2×90591393431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90591393461) 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, 565916 + ... + 708126.

It is an arithmetic number, because the mean of its divisors is an integer number (7059972528).

Almost surely, 2^90591393431 is an apocalyptic number.

90591393431 is a deficient number, since it is larger than the sum of its proper divisors (22368167017).

90591393431 is a wasteful number, since it uses less digits than its factorization.

90591393431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150502.

The product of its (nonzero) digits is 393660, while the sum is 47.

The spelling of 90591393431 in words is "ninety billion, five hundred ninety-one million, three hundred ninety-three thousand, four hundred thirty-one".