91086258025 has 27 divisors (see below), whose sum is σ = 131402518551. Its totient is φ = 62451905040.

The previous prime is 91086258013. The next prime is 91086258031. The reversal of 91086258025 is 52085268019.

The square root of 91086258025 is 301805.

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

It can be written as a sum of positive squares in only one way, i.e., 32791052889 + 58295205136 = 181083^2 + 241444^2 .

It is not a de Polignac number, because 91086258025 - 2¹⁵ = 91086225257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10558864 + ... + 10567486.

Almost surely, 2^91086258025 is an apocalyptic number.

91086258025 is the 301805-th square number.

91086258025 is the 150903-rd centered octagonal number.

It is an amenable number.

91086258025 is a deficient number, since it is larger than the sum of its proper divisors (40316260526).

91086258025 is an frugal number, since it uses more digits than its factorization.

91086258025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17270 (or 8635 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 91086258025 in words is "ninety-one billion, eighty-six million, two hundred fifty-eight thousand, twenty-five".