91988094231 has 32 divisors (see below), whose sum is σ = 150761571840. Its totient is φ = 54965131200.

The previous prime is 91988094199. The next prime is 91988094251. The reversal of 91988094231 is 13249088919.

It is not a de Polignac number, because 91988094231 - 2⁵ = 91988094199 is a prime.

It is a super-2 number, since 2×91988094231² (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 (91988094251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2160070 + ... + 2202243.

It is an arithmetic number, because the mean of its divisors is an integer number (4711299120).

Almost surely, 2^91988094231 is an apocalyptic number.

91988094231 is a deficient number, since it is larger than the sum of its proper divisors (58773477609).

91988094231 is a wasteful number, since it uses less digits than its factorization.

91988094231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362404 (or 4362398 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 91988094231 in words is "ninety-one billion, nine hundred eighty-eight million, ninety-four thousand, two hundred thirty-one".