91625015 has 4 divisors (see below), whose sum is σ = 109950024. Its totient is φ = 73300008.

The previous prime is 91624993. The next prime is 91625021. The reversal of 91625015 is 51052619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51052619 = 1753 ⋅29123.

It is a cyclic number.

It is not a de Polignac number, because 91625015 - 2⁸ = 91624759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9162497 + ... + 9162506.

It is an arithmetic number, because the mean of its divisors is an integer number (27487506).

Almost surely, 2^91625015 is an apocalyptic number.

91625015 is a deficient number, since it is larger than the sum of its proper divisors (18325009).

91625015 is a wasteful number, since it uses less digits than its factorization.

91625015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18325008.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 91625015 is about 9572.0956430658. The cubic root of 91625015 is about 450.8215690998.

The spelling of 91625015 in words is "ninety-one million, six hundred twenty-five thousand, fifteen".