91831965 has 16 divisors (see below), whose sum is σ = 150903168. Its totient is φ = 47653056.

The previous prime is 91831931. The next prime is 91831967. The reversal of 91831965 is 56913819.

It is not a de Polignac number, because 91831965 - 2⁷ = 91831837 is a prime.

It is a super-2 number, since 2×91831965² = 16866219591522450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91831967) 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, 82177 + ... + 83286.

It is an arithmetic number, because the mean of its divisors is an integer number (9431448).

Almost surely, 2^91831965 is an apocalyptic number.

It is an amenable number.

91831965 is a deficient number, since it is larger than the sum of its proper divisors (59071203).

91831965 is a wasteful number, since it uses less digits than its factorization.

91831965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165508.

The product of its digits is 58320, while the sum is 42.

The square root of 91831965 is about 9582.8996133738. The cubic root of 91831965 is about 451.1607318244.

The spelling of 91831965 in words is "ninety-one million, eight hundred thirty-one thousand, nine hundred sixty-five".