91608939 has 12 divisors (see below), whose sum is σ = 132880800. Its totient is φ = 60815664.

The previous prime is 91608911. The next prime is 91608943. The reversal of 91608939 is 93980619.

91608939 is a `hidden beast` number, since 9 + 1 + 608 + 9 + 39 = 666.

It is not a de Polignac number, because 91608939 - 2⁸ = 91608683 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 91608894 and 91608903.

It is not an unprimeable number, because it can be changed into a prime (91608239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19144 + ... + 23445.

It is an arithmetic number, because the mean of its divisors is an integer number (11073400).

Almost surely, 2^91608939 is an apocalyptic number.

91608939 is a deficient number, since it is larger than the sum of its proper divisors (41271861).

91608939 is a wasteful number, since it uses less digits than its factorization.

91608939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42834 (or 42831 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 91608939 is about 9571.2558737085. The cubic root of 91608939 is about 450.7952013681.

The spelling of 91608939 in words is "ninety-one million, six hundred eight thousand, nine hundred thirty-nine".