91921316 has 12 divisors (see below), whose sum is σ = 169328880. Its totient is φ = 43541640.

The previous prime is 91921279. The next prime is 91921321. The reversal of 91921316 is 61312919.

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, 604670 + ... + 604821.

It is an arithmetic number, because the mean of its divisors is an integer number (14110740).

Almost surely, 2^91921316 is an apocalyptic number.

It is an amenable number.

91921316 is a deficient number, since it is larger than the sum of its proper divisors (77407564).

91921316 is a wasteful number, since it uses less digits than its factorization.

91921316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209514 (or 1209512 counting only the distinct ones).

The product of its digits is 2916, while the sum is 32.

The square root of 91921316 is about 9587.5604822082. The cubic root of 91921316 is about 451.3070083975.

The spelling of 91921316 in words is "ninety-one million, nine hundred twenty-one thousand, three hundred sixteen".