91136515908 has 96 divisors (see below), whose sum is σ = 238048675200. Its totient is φ = 26968467456.

The previous prime is 91136515871. The next prime is 91136515957. The reversal of 91136515908 is 80951563119.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 836266 + ... + 938942.

It is an arithmetic number, because the mean of its divisors is an integer number (2479673700).

Almost surely, 2^91136515908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91136515908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119024337600).

91136515908 is an abundant number, since it is smaller than the sum of its proper divisors (146912159292).

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

91136515908 is a wasteful number, since it uses less digits than its factorization.

91136515908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102949 (or 102947 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 48.

The spelling of 91136515908 in words is "ninety-one billion, one hundred thirty-six million, five hundred fifteen thousand, nine hundred eight".