91564925 has 6 divisors (see below), whose sum is σ = 113540538. Its totient is φ = 73251920.

The previous prime is 91564903. The next prime is 91564943. The reversal of 91564925 is 52946519.

91564925 = T₂₆₉₄ + T₂₆₉₅ + ... + T₂₇₁₈.

It can be written as a sum of positive squares in 3 ways, for example, as 5112121 + 86452804 = 2261^2 + 9298^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91564925 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1831274 + ... + 1831323.

It is an arithmetic number, because the mean of its divisors is an integer number (18923423).

Almost surely, 2^91564925 is an apocalyptic number.

It is an amenable number.

91564925 is a deficient number, since it is larger than the sum of its proper divisors (21975613).

91564925 is a wasteful number, since it uses less digits than its factorization.

91564925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662607 (or 3662602 counting only the distinct ones).

The product of its digits is 97200, while the sum is 41.

The square root of 91564925 is about 9568.9563171748. The cubic root of 91564925 is about 450.7229941553.

The spelling of 91564925 in words is "ninety-one million, five hundred sixty-four thousand, nine hundred twenty-five".