91281516 has 24 divisors (see below), whose sum is σ = 218747760. Its totient is φ = 29604672.

The previous prime is 91281497. The next prime is 91281521. The reversal of 91281516 is 61518219.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102351 + ... + 103238.

It is an arithmetic number, because the mean of its divisors is an integer number (9114490).

Almost surely, 2^91281516 is an apocalyptic number.

It is an amenable number.

91281516 is an abundant number, since it is smaller than the sum of its proper divisors (127466244).

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

91281516 is a wasteful number, since it uses less digits than its factorization.

91281516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205633 (or 205631 counting only the distinct ones).

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

The square root of 91281516 is about 9554.1360676934. The cubic root of 91281516 is about 450.2574921398.

It can be divided in two parts, 912 and 81516, that added together give a palindrome (82428).

The spelling of 91281516 in words is "ninety-one million, two hundred eighty-one thousand, five hundred sixteen".