91831313 has 24 divisors (see below), whose sum is σ = 114553920. Its totient is φ = 71910720.

The previous prime is 91831303. The next prime is 91831319. The reversal of 91831313 is 31313819.

It is not a de Polignac number, because 91831313 - 2⁸ = 91831057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91831319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111443 + ... + 112263.

It is an arithmetic number, because the mean of its divisors is an integer number (4773080).

Almost surely, 2^91831313 is an apocalyptic number.

It is an amenable number.

91831313 is a deficient number, since it is larger than the sum of its proper divisors (22722607).

91831313 is a wasteful number, since it uses less digits than its factorization.

91831313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 876 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 91831313 is about 9582.8655943825. The cubic root of 91831313 is about 451.1596640862.

The spelling of 91831313 in words is "ninety-one million, eight hundred thirty-one thousand, three hundred thirteen".