91604893 has 2 divisors, whose sum is σ = 91604894. Its totient is φ = 91604892.

The previous prime is 91604873. The next prime is 91604897. The reversal of 91604893 is 39840619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91145209 + 459684 = 9547^2 + 678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91604893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91604897) by changing a digit.

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 as a sum of consecutive naturals, namely, 45802446 + 45802447.

It is an arithmetic number, because the mean of its divisors is an integer number (45802447).

Almost surely, 2^91604893 is an apocalyptic number.

It is an amenable number.

91604893 is a deficient number, since it is larger than the sum of its proper divisors (1).

91604893 is an equidigital number, since it uses as much as digits as its factorization.

91604893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 91604893 is about 9571.0445093522. The cubic root of 91604893 is about 450.7885646641.

The spelling of 91604893 in words is "ninety-one million, six hundred four thousand, eight hundred ninety-three".