91435457 has 2 divisors, whose sum is σ = 91435458. Its totient is φ = 91435456.

The previous prime is 91435447. The next prime is 91435471. The reversal of 91435457 is 75453419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90801841 + 633616 = 9529^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 91435457 - 2¹⁶ = 91369921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91435457.

It is not a weakly prime, because it can be changed into another prime (91435417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45717728 + 45717729.

It is an arithmetic number, because the mean of its divisors is an integer number (45717729).

Almost surely, 2^91435457 is an apocalyptic number.

It is an amenable number.

91435457 is a deficient number, since it is larger than the sum of its proper divisors (1).

91435457 is an equidigital number, since it uses as much as digits as its factorization.

91435457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 38.

The square root of 91435457 is about 9562.1889230448. The cubic root of 91435457 is about 450.5104610647.

The spelling of 91435457 in words is "ninety-one million, four hundred thirty-five thousand, four hundred fifty-seven".