91115616 has 24 divisors (see below), whose sum is σ = 239178744. Its totient is φ = 30371840.

The previous prime is 91115611. The next prime is 91115617. The reversal of 91115616 is 61651119.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91115611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474465 + ... + 474656.

It is an arithmetic number, because the mean of its divisors is an integer number (9965781).

Almost surely, 2^91115616 is an apocalyptic number.

91115616 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

91115616 is an abundant number, since it is smaller than the sum of its proper divisors (148063128).

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

91115616 is a wasteful number, since it uses less digits than its factorization.

91115616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949134 (or 949126 counting only the distinct ones).

The product of its digits is 1620, while the sum is 30.

The square root of 91115616 is about 9545.4500155833. The cubic root of 91115616 is about 449.9845525562.

The spelling of 91115616 in words is "ninety-one million, one hundred fifteen thousand, six hundred sixteen".