91261333631 has 32 divisors (see below), whose sum is σ = 107708227200. Its totient is φ = 76511232000.

The previous prime is 91261333621. The next prime is 91261333673. The reversal of 91261333631 is 13633316219.

It is a cyclic number.

It is not a de Polignac number, because 91261333631 - 2¹⁴ = 91261317247 is a prime.

It is a super-2 number, since 2×91261333631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91261333621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22807631 + ... + 22811631.

It is an arithmetic number, because the mean of its divisors is an integer number (3365882100).

Almost surely, 2^91261333631 is an apocalyptic number.

91261333631 is a deficient number, since it is larger than the sum of its proper divisors (16446893569).

91261333631 is a wasteful number, since it uses less digits than its factorization.

91261333631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619.

The product of its digits is 52488, while the sum is 38.

The spelling of 91261333631 in words is "ninety-one billion, two hundred sixty-one million, three hundred thirty-three thousand, six hundred thirty-one".