91226215125 has 24 divisors (see below), whose sum is σ = 164450459160. Its totient is φ = 48653980800.

The previous prime is 91226215057. The next prime is 91226215139. The reversal of 91226215125 is 52151262219.

91226215125 is a `hidden beast` number, since 9 + 1 + 2 + 2 + 621 + 5 + 1 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5279911569 + 85946303556 = 72663^2 + 293166^2 .

It is not a de Polignac number, because 91226215125 - 2⁸ = 91226214869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91226215125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40543860 + ... + 40546109.

It is an arithmetic number, because the mean of its divisors is an integer number (6852102465).

Almost surely, 2^91226215125 is an apocalyptic number.

It is an amenable number.

91226215125 is a deficient number, since it is larger than the sum of its proper divisors (73224244035).

91226215125 is a wasteful number, since it uses less digits than its factorization.

91226215125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81089990 (or 81089977 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 91226215125 in words is "ninety-one billion, two hundred twenty-six million, two hundred fifteen thousand, one hundred twenty-five".