91236243231 has 12 divisors (see below), whose sum is σ = 150612211152. Its totient is φ = 52134996096.

The previous prime is 91236243199. The next prime is 91236243233. The reversal of 91236243231 is 13234263219.

91236243231 is a `hidden beast` number, since 9 + 1 + 2 + 3 + 624 + 3 + 23 + 1 = 666.

It is not a de Polignac number, because 91236243231 - 2⁵ = 91236243199 is a prime.

It is a super-2 number, since 2×91236243231² (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 (91236243233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 724097106 + ... + 724097231.

It is an arithmetic number, because the mean of its divisors is an integer number (12551017596).

Almost surely, 2^91236243231 is an apocalyptic number.

91236243231 is a deficient number, since it is larger than the sum of its proper divisors (59375967921).

91236243231 is a wasteful number, since it uses less digits than its factorization.

91236243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448194350 (or 1448194347 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The spelling of 91236243231 in words is "ninety-one billion, two hundred thirty-six million, two hundred forty-three thousand, two hundred thirty-one".