91564136 has 16 divisors (see below), whose sum is σ = 177603300. Its totient is φ = 44203264.

The previous prime is 91564117. The next prime is 91564139. The reversal of 91564136 is 63146519.

It can be written as a sum of positive squares in 2 ways, for example, as 79103236 + 12460900 = 8894^2 + 3530^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91564096 and 91564105.

It is not an unprimeable number, because it can be changed into a prime (91564139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197105 + ... + 197568.

Almost surely, 2^91564136 is an apocalyptic number.

It is an amenable number.

91564136 is a deficient number, since it is larger than the sum of its proper divisors (86039164).

91564136 is a wasteful number, since it uses less digits than its factorization.

91564136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394708 (or 394704 counting only the distinct ones).

The product of its digits is 19440, while the sum is 35.

The square root of 91564136 is about 9568.9150900193. The cubic root of 91564136 is about 450.7216995494.

The spelling of 91564136 in words is "ninety-one million, five hundred sixty-four thousand, one hundred thirty-six".