91059731488 has 48 divisors (see below), whose sum is σ = 200857212864. Its totient is φ = 40272111360.

The previous prime is 91059731471. The next prime is 91059731513. The reversal of 91059731488 is 88413795019.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3482820 + ... + 3508867.

It is an arithmetic number, because the mean of its divisors is an integer number (4184525268).

Almost surely, 2^91059731488 is an apocalyptic number.

It is an amenable number.

91059731488 is an abundant number, since it is smaller than the sum of its proper divisors (109797481376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91059731488 is a wasteful number, since it uses less digits than its factorization.

91059731488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991745 (or 6991737 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 91059731488 in words is "ninety-one billion, fifty-nine million, seven hundred thirty-one thousand, four hundred eighty-eight".