91812516 has 12 divisors (see below), whose sum is σ = 214229232. Its totient is φ = 30604168.

The previous prime is 91812509. The next prime is 91812533. The reversal of 91812516 is 61521819.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3825510 + ... + 3825533.

It is an arithmetic number, because the mean of its divisors is an integer number (17852436).

Almost surely, 2^91812516 is an apocalyptic number.

It is an amenable number.

91812516 is an abundant number, since it is smaller than the sum of its proper divisors (122416716).

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

91812516 is a wasteful number, since it uses less digits than its factorization.

91812516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651050 (or 7651048 counting only the distinct ones).

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

The square root of 91812516 is about 9581.8847832772. The cubic root of 91812516 is about 451.1288792823.

The spelling of 91812516 in words is "ninety-one million, eight hundred twelve thousand, five hundred sixteen".