91320631 has 8 divisors (see below), whose sum is σ = 96364800. Its totient is φ = 86300280.

The previous prime is 91320629. The next prime is 91320641. The reversal of 91320631 is 13602319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91320631 - 2¹ = 91320629 is a prime.

It is a super-2 number, since 2×91320631² = 16678915292476322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91320596 and 91320605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91320641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2226 + ... + 13696.

It is an arithmetic number, because the mean of its divisors is an integer number (12045600).

Almost surely, 2^91320631 is an apocalyptic number.

91320631 is a deficient number, since it is larger than the sum of its proper divisors (5044169).

91320631 is a wasteful number, since it uses less digits than its factorization.

91320631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11909.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 91320631 is about 9556.1828676517. The cubic root of 91320631 is about 450.3217961653.

The spelling of 91320631 in words is "ninety-one million, three hundred twenty thousand, six hundred thirty-one".