91571374897 has 2 divisors, whose sum is σ = 91571374898. Its totient is φ = 91571374896.

The previous prime is 91571374849. The next prime is 91571374901. The reversal of 91571374897 is 79847317519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90622673296 + 948701601 = 301036^2 + 30801^2 .

It is a cyclic number.

It is not a de Polignac number, because 91571374897 - 2²⁷ = 91437157169 is a prime.

It is not a weakly prime, because it can be changed into another prime (91571371897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45785687448 + 45785687449.

It is an arithmetic number, because the mean of its divisors is an integer number (45785687449).

Almost surely, 2^91571374897 is an apocalyptic number.

It is an amenable number.

91571374897 is a deficient number, since it is larger than the sum of its proper divisors (1).

91571374897 is an equidigital number, since it uses as much as digits as its factorization.

91571374897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 61.

The spelling of 91571374897 in words is "ninety-one billion, five hundred seventy-one million, three hundred seventy-four thousand, eight hundred ninety-seven".