91512816 has 40 divisors (see below), whose sum is σ = 248853120. Its totient is φ = 28898496.

The previous prime is 91512809. The next prime is 91512829. The reversal of 91512816 is 61821519.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49260 + ... + 51083.

It is an arithmetic number, because the mean of its divisors is an integer number (6221328).

Almost surely, 2^91512816 is an apocalyptic number.

It is an amenable number.

91512816 is an abundant number, since it is smaller than the sum of its proper divisors (157340304).

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

91512816 is a wasteful number, since it uses less digits than its factorization.

91512816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100373 (or 100367 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 91512816 is about 9566.2331144500. The cubic root of 91512816 is about 450.6374767613.

It can be divided in two parts, 915 and 12816, that added together give a palindrome (13731).

The spelling of 91512816 in words is "ninety-one million, five hundred twelve thousand, eight hundred sixteen".