91331131 has 4 divisors (see below), whose sum is σ = 91878192. Its totient is φ = 90784072.

The previous prime is 91331129. The next prime is 91331143. The reversal of 91331131 is 13113319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91331131 - 2¹ = 91331129 is a prime.

It is a super-2 number, since 2×91331131² = 16682750979478322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91331101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273280 + ... + 273613.

It is an arithmetic number, because the mean of its divisors is an integer number (22969548).

Almost surely, 2^91331131 is an apocalyptic number.

91331131 is a deficient number, since it is larger than the sum of its proper divisors (547061).

91331131 is a wasteful number, since it uses less digits than its factorization.

91331131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547060.

The product of its digits is 243, while the sum is 22.

The square root of 91331131 is about 9556.7322343990. The cubic root of 91331131 is about 450.3390547614.

The spelling of 91331131 in words is "ninety-one million, three hundred thirty-one thousand, one hundred thirty-one".