91579903 has 2 divisors, whose sum is σ = 91579904. Its totient is φ = 91579902.

The previous prime is 91579897. The next prime is 91579907. The reversal of 91579903 is 30997519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91579903 - 2⁵ = 91579871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91579903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91579907) 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, 45789951 + 45789952.

It is an arithmetic number, because the mean of its divisors is an integer number (45789952).

Almost surely, 2^91579903 is an apocalyptic number.

91579903 is a deficient number, since it is larger than the sum of its proper divisors (1).

91579903 is an equidigital number, since it uses as much as digits as its factorization.

91579903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 91579903 is about 9569.7389201587. The cubic root of 91579903 is about 450.7475689254.

The spelling of 91579903 in words is "ninety-one million, five hundred seventy-nine thousand, nine hundred three".