91514772972 has 126 divisors (see below), whose sum is σ = 279319555788. Its totient is φ = 26147037168.

The previous prime is 91514772959. The next prime is 91514773001. The reversal of 91514772972 is 27927741519.

It is a tau number, because it is divible by the number of its divisors (126).

It is a super-3 number, since 3×91514772972³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 177358 + ... + 463125.

Almost surely, 2^91514772972 is an apocalyptic number.

It is an amenable number.

91514772972 is an abundant number, since it is smaller than the sum of its proper divisors (187804782816).

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

91514772972 is a wasteful number, since it uses less digits than its factorization.

91514772972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640519 (or 640495 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The spelling of 91514772972 in words is "ninety-one billion, five hundred fourteen million, seven hundred seventy-two thousand, nine hundred seventy-two".