91317725 has 12 divisors (see below), whose sum is σ = 113528820. Its totient is φ = 72864000.

The previous prime is 91317719. The next prime is 91317731. The reversal of 91317725 is 52771319.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91317719) and next prime (91317731).

It can be written as a sum of positive squares in 6 ways, for example, as 38809 + 91278916 = 197^2 + 9554^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91317725 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5471 + ... + 14579.

It is an arithmetic number, because the mean of its divisors is an integer number (9460735).

Almost surely, 2^91317725 is an apocalyptic number.

It is an amenable number.

91317725 is a deficient number, since it is larger than the sum of its proper divisors (22211095).

91317725 is a wasteful number, since it uses less digits than its factorization.

91317725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520 (or 9515 counting only the distinct ones).

The product of its digits is 13230, while the sum is 35.

The square root of 91317725 is about 9556.0308182843. The cubic root of 91317725 is about 450.3170194097.

The spelling of 91317725 in words is "ninety-one million, three hundred seventeen thousand, seven hundred twenty-five".