91712331 has 36 divisors (see below), whose sum is σ = 146443752. Its totient is φ = 57158784.

The previous prime is 91712329. The next prime is 91712351. The reversal of 91712331 is 13321719.

It is not a de Polignac number, because 91712331 - 2¹ = 91712329 is a prime.

It is a super-2 number, since 2×91712331² = 16822303314907122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 91712295 and 91712304.

It is not an unprimeable number, because it can be changed into a prime (91712311) 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 35 ways as a sum of consecutive naturals, for example, 615445 + ... + 615593.

It is an arithmetic number, because the mean of its divisors is an integer number (4067882).

Almost surely, 2^91712331 is an apocalyptic number.

91712331 is a deficient number, since it is larger than the sum of its proper divisors (54731421).

91712331 is an equidigital number, since it uses as much as digits as its factorization.

91712331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 169 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 91712331 is about 9576.6555226760. The cubic root of 91712331 is about 450.9647302897.

The spelling of 91712331 in words is "ninety-one million, seven hundred twelve thousand, three hundred thirty-one".