91625215 has 16 divisors (see below), whose sum is σ = 125162496. Its totient is φ = 63738400.

The previous prime is 91625213. The next prime is 91625251. The reversal of 91625215 is 51252619.

It is not a de Polignac number, because 91625215 - 2¹ = 91625213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91625213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34951 + ... + 37480.

It is an arithmetic number, because the mean of its divisors is an integer number (7822656).

Almost surely, 2^91625215 is an apocalyptic number.

91625215 is a deficient number, since it is larger than the sum of its proper divisors (33537281).

91625215 is a wasteful number, since it uses less digits than its factorization.

91625215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72470.

The product of its digits is 5400, while the sum is 31.

The square root of 91625215 is about 9572.1060900932. The cubic root of 91625215 is about 450.8218971189.

The spelling of 91625215 in words is "ninety-one million, six hundred twenty-five thousand, two hundred fifteen".