91664541 has 20 divisors (see below), whose sum is σ = 138272992. Its totient is φ = 60510888.

The previous prime is 91664497. The next prime is 91664543. The reversal of 91664541 is 14546619.

91664541 is a `hidden beast` number, since 9 + 1 + 6 + 645 + 4 + 1 = 666.

It is not a de Polignac number, because 91664541 - 2⁶ = 91664477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91664496 and 91664505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91664543) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2850 + ... + 13836.

Almost surely, 2^91664541 is an apocalyptic number.

It is an amenable number.

91664541 is a deficient number, since it is larger than the sum of its proper divisors (46608451).

91664541 is a wasteful number, since it uses less digits than its factorization.

91664541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102 (or 11093 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 91664541 is about 9574.1600675986. The cubic root of 91664541 is about 450.8863862302.

The spelling of 91664541 in words is "ninety-one million, six hundred sixty-four thousand, five hundred forty-one".