91424591 has 2 divisors, whose sum is σ = 91424592. Its totient is φ = 91424590.

The previous prime is 91424587. The next prime is 91424603. The reversal of 91424591 is 19542419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91424591 - 2² = 91424587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91424191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45712295 + 45712296.

It is an arithmetic number, because the mean of its divisors is an integer number (45712296).

Almost surely, 2^91424591 is an apocalyptic number.

91424591 is a deficient number, since it is larger than the sum of its proper divisors (1).

91424591 is an equidigital number, since it uses as much as digits as its factorization.

91424591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 91424591 is about 9561.6207308176. The cubic root of 91424591 is about 450.4926144483.

The spelling of 91424591 in words is "ninety-one million, four hundred twenty-four thousand, five hundred ninety-one".