91512591492 has 36 divisors (see below), whose sum is σ = 248391321360. Its totient is φ = 26146454544.

The previous prime is 91512591479. The next prime is 91512591493. The reversal of 91512591492 is 29419521519.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91512591493) 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, 77816242 + ... + 77817417.

Almost surely, 2^91512591492 is an apocalyptic number.

It is an amenable number.

91512591492 is an abundant number, since it is smaller than the sum of its proper divisors (156878729868).

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

91512591492 is a wasteful number, since it uses less digits than its factorization.

91512591492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155633680 (or 155633671 counting only the distinct ones).

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

The spelling of 91512591492 in words is "ninety-one billion, five hundred twelve million, five hundred ninety-one thousand, four hundred ninety-two".