91561136 has 20 divisors (see below), whose sum is σ = 177550392. Its totient is φ = 45741696.

The previous prime is 91561121. The next prime is 91561163. The reversal of 91561136 is 63116519.

It is a happy number.

It is a super-2 number, since 2×91561136² = 16766883251220992, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 30620 + ... + 33476.

Almost surely, 2^91561136 is an apocalyptic number.

It is an amenable number.

91561136 is a deficient number, since it is larger than the sum of its proper divisors (85989256).

91561136 is a wasteful number, since it uses less digits than its factorization.

91561136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4868 (or 4862 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 91561136 is about 9568.7583311525. The cubic root of 91561136 is about 450.7167770258.

The spelling of 91561136 in words is "ninety-one million, five hundred sixty-one thousand, one hundred thirty-six".