91315520 has 112 divisors (see below), whose sum is σ = 239207040. Its totient is φ = 33048576.

The previous prime is 91315493. The next prime is 91315537. The reversal of 91315520 is 2551319.

It is a self number, because there is not a number n which added to its sum of digits gives 91315520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139514 + ... + 140166.

Almost surely, 2^91315520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91315520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119603520).

91315520 is an abundant number, since it is smaller than the sum of its proper divisors (147891520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91315520 is a wasteful number, since it uses less digits than its factorization.

91315520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 702 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 91315520 is about 9555.9154454191. The cubic root of 91315520 is about 450.3133948595.

Adding to 91315520 its reverse (2551319), we get a palindrome (93866839).

The spelling of 91315520 in words is "ninety-one million, three hundred fifteen thousand, five hundred twenty".