91994491 has 2 divisors, whose sum is σ = 91994492. Its totient is φ = 91994490.

The previous prime is 91994477. The next prime is 91994519. The reversal of 91994491 is 19449919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91994491 - 2⁷ = 91994363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91994401) 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, 45997245 + 45997246.

It is an arithmetic number, because the mean of its divisors is an integer number (45997246).

Almost surely, 2^91994491 is an apocalyptic number.

91994491 is a deficient number, since it is larger than the sum of its proper divisors (1).

91994491 is an equidigital number, since it uses as much as digits as its factorization.

91994491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 91994491 is about 9591.3758658495. The cubic root of 91994491 is about 451.4267326447.

The spelling of 91994491 in words is "ninety-one million, nine hundred ninety-four thousand, four hundred ninety-one".