91971479824 has 45 divisors (see below), whose sum is σ = 207306901431. Its totient is φ = 39412709280.

The previous prime is 91971479807. The next prime is 91971479851. The reversal of 91971479824 is 42897417919.

The square root of 91971479824 is 303268.

It is a perfect power (a square), and thus also a powerful number.

It is a super-3 number, since 3×91971479824³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8486089 + ... + 8496919.

Almost surely, 2^91971479824 is an apocalyptic number.

91971479824 is the 303268-th square number.

It is an amenable number.

91971479824 is an abundant number, since it is smaller than the sum of its proper divisors (115335421607).

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

91971479824 is an frugal number, since it uses more digits than its factorization.

91971479824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21684 (or 10840 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 61.

The spelling of 91971479824 in words is "ninety-one billion, nine hundred seventy-one million, four hundred seventy-nine thousand, eight hundred twenty-four".