91915971192 has 48 divisors (see below), whose sum is σ = 257523201000. Its totient is φ = 29582150976.

The previous prime is 91915971151. The next prime is 91915971197. The reversal of 91915971192 is 29117951919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91915971197) 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, 22008442 + ... + 22012617.

Almost surely, 2^91915971192 is an apocalyptic number.

It is an amenable number.

91915971192 is an abundant number, since it is smaller than the sum of its proper divisors (165607229808).

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

91915971192 is a wasteful number, since it uses less digits than its factorization.

91915971192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44021100 (or 44021093 counting only the distinct ones).

The product of its digits is 459270, while the sum is 54.

The spelling of 91915971192 in words is "ninety-one billion, nine hundred fifteen million, nine hundred seventy-one thousand, one hundred ninety-two".