91996531 has 8 divisors (see below), whose sum is σ = 102495744. Its totient is φ = 81853320.

The previous prime is 91996523. The next prime is 91996543. The reversal of 91996531 is 13569919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91996531 - 2³ = 91996523 is a prime.

It is a super-2 number, since 2×91996531² = 16926723432067922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91996501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88455 + ... + 89488.

It is an arithmetic number, because the mean of its divisors is an integer number (12811968).

Almost surely, 2^91996531 is an apocalyptic number.

91996531 is a deficient number, since it is larger than the sum of its proper divisors (10499213).

91996531 is a wasteful number, since it uses less digits than its factorization.

91996531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178001.

The product of its digits is 65610, while the sum is 43.

The square root of 91996531 is about 9591.4822107952. The cubic root of 91996531 is about 451.4300694522.

The spelling of 91996531 in words is "ninety-one million, nine hundred ninety-six thousand, five hundred thirty-one".