91440257059 has 2 divisors, whose sum is σ = 91440257060. Its totient is φ = 91440257058.

The previous prime is 91440256993. The next prime is 91440257087. The reversal of 91440257059 is 95075204419.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91440257059 - 2²¹ = 91438159907 is a prime.

It is a super-2 number, since 2×91440257059² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91440257089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45720128529 + 45720128530.

It is an arithmetic number, because the mean of its divisors is an integer number (45720128530).

Almost surely, 2^91440257059 is an apocalyptic number.

91440257059 is a deficient number, since it is larger than the sum of its proper divisors (1).

91440257059 is an equidigital number, since it uses as much as digits as its factorization.

91440257059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 91440257059 in words is "ninety-one billion, four hundred forty million, two hundred fifty-seven thousand, fifty-nine".