91204457 has 2 divisors, whose sum is σ = 91204458. Its totient is φ = 91204456.

The previous prime is 91204411. The next prime is 91204469. The reversal of 91204457 is 75440219.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81288256 + 9916201 = 9016^2 + 3149^2 .

It is an emirp because it is prime and its reverse (75440219) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91204457 is a prime.

It is equal to p_5282834 and since 91204457 and 5282834 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (91204357) 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, 45602228 + 45602229.

It is an arithmetic number, because the mean of its divisors is an integer number (45602229).

Almost surely, 2^91204457 is an apocalyptic number.

It is an amenable number.

91204457 is a deficient number, since it is larger than the sum of its proper divisors (1).

91204457 is an equidigital number, since it uses as much as digits as its factorization.

91204457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 91204457 is about 9550.1024601833. The cubic root of 91204457 is about 450.1307554187.

The spelling of 91204457 in words is "ninety-one million, two hundred four thousand, four hundred fifty-seven".