91279515625 has 21 divisors (see below), whose sum is σ = 114145160017. Its totient is φ = 72993400000.

The previous prime is 91279515617. The next prime is 91279515661. The reversal of 91279515625 is 52651597219.

The square root of 91279515625 is 302125.

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

It can be written as a sum of positive squares in 10 ways, for example, as 87789541849 + 3489973776 = 296293^2 + 59076^2 .

It is not a de Polignac number, because 91279515625 - 2³ = 91279515617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 37764417 + ... + 37766833.

Almost surely, 2^91279515625 is an apocalyptic number.

91279515625 is the 302125-th square number.

91279515625 is the 151063-rd centered octagonal number.

It is an amenable number.

91279515625 is a deficient number, since it is larger than the sum of its proper divisors (22865644392).

91279515625 is an frugal number, since it uses more digits than its factorization.

91279515625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864 (or 2422 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 52.

The spelling of 91279515625 in words is "ninety-one billion, two hundred seventy-nine million, five hundred fifteen thousand, six hundred twenty-five".