91115520 has 104 divisors (see below), whose sum is σ = 291730656. Its totient is φ = 24281088.

The previous prime is 91115509. The next prime is 91115527. The reversal of 91115520 is 2551119.

It is a super-3 number, since 3×91115520³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91115527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60699 + ... + 62181.

Almost surely, 2^91115520 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 91115520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145865328).

91115520 is an abundant number, since it is smaller than the sum of its proper divisors (200615136).

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

91115520 is a wasteful number, since it uses less digits than its factorization.

91115520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515 (or 1493 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 91115520 is about 9545.4449870082. Note that the first 3 decimals coincide. The cubic root of 91115520 is about 449.9843945206.

Adding to 91115520 its reverse (2551119), we get a palindrome (93666639).

The spelling of 91115520 in words is "ninety-one million, one hundred fifteen thousand, five hundred twenty".