91641604 has 6 divisors (see below), whose sum is σ = 160372814. Its totient is φ = 45820800.

The previous prime is 91641547. The next prime is 91641607. The reversal of 91641604 is 40614619.

It can be written as a sum of positive squares in only one way, i.e., 91393600 + 248004 = 9560^2 + 498^2 .

It is not an unprimeable number, because it can be changed into a prime (91641607) by changing a digit.

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 as a sum of consecutive naturals, namely, 11455197 + ... + 11455204.

Almost surely, 2^91641604 is an apocalyptic number.

It is an amenable number.

91641604 is a deficient number, since it is larger than the sum of its proper divisors (68731210).

91641604 is a wasteful number, since it uses less digits than its factorization.

91641604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22910405 (or 22910403 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 91641604 is about 9572.9621330077. The cubic root of 91641604 is about 450.8487750170.

The spelling of 91641604 in words is "ninety-one million, six hundred forty-one thousand, six hundred four".