91331361 has 32 divisors (see below), whose sum is σ = 156297600. Its totient is φ = 52093440.

The previous prime is 91331311. The next prime is 91331369. The reversal of 91331361 is 16313319.

It is not a de Polignac number, because 91331361 - 2⁶ = 91331297 is a prime.

It is a super-2 number, since 2×91331361² = 16682835004224642, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (91331369) 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 31 ways as a sum of consecutive naturals, for example, 3996 + ... + 14093.

It is an arithmetic number, because the mean of its divisors is an integer number (4884300).

Almost surely, 2^91331361 is an apocalyptic number.

It is an amenable number.

91331361 is a deficient number, since it is larger than the sum of its proper divisors (64966239).

91331361 is a wasteful number, since it uses less digits than its factorization.

91331361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18126 (or 18120 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 91331361 is about 9556.7442677933. The cubic root of 91331361 is about 450.3394327920.

The spelling of 91331361 in words is "ninety-one million, three hundred thirty-one thousand, three hundred sixty-one".