91432853257 has 2 divisors, whose sum is σ = 91432853258. Its totient is φ = 91432853256.

The previous prime is 91432853191. The next prime is 91432853263. The reversal of 91432853257 is 75235823419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88116360336 + 3316492921 = 296844^2 + 57589^2 .

It is a cyclic number.

It is not a de Polignac number, because 91432853257 - 2³¹ = 89285369609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91432853257.

It is not a weakly prime, because it can be changed into another prime (91432853857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45716426628 + 45716426629.

It is an arithmetic number, because the mean of its divisors is an integer number (45716426629).

Almost surely, 2^91432853257 is an apocalyptic number.

It is an amenable number.

91432853257 is a deficient number, since it is larger than the sum of its proper divisors (1).

91432853257 is an equidigital number, since it uses as much as digits as its factorization.

91432853257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 49.

The spelling of 91432853257 in words is "ninety-one billion, four hundred thirty-two million, eight hundred fifty-three thousand, two hundred fifty-seven".