91604479 has 2 divisors, whose sum is σ = 91604480. Its totient is φ = 91604478.

The previous prime is 91604437. The next prime is 91604543. The reversal of 91604479 is 97440619.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91604479 - 2¹¹ = 91602431 is a prime.

It is a super-2 number, since 2×91604479² = 16782761145722882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91604179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45802239 + 45802240.

It is an arithmetic number, because the mean of its divisors is an integer number (45802240).

Almost surely, 2^91604479 is an apocalyptic number.

91604479 is a deficient number, since it is larger than the sum of its proper divisors (1).

91604479 is an equidigital number, since it uses as much as digits as its factorization.

91604479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 91604479 is about 9571.0228815942. The cubic root of 91604479 is about 450.7878855637.

The spelling of 91604479 in words is "ninety-one million, six hundred four thousand, four hundred seventy-nine".