91571454361 has 2 divisors, whose sum is σ = 91571454362. Its totient is φ = 91571454360.

The previous prime is 91571454349. The next prime is 91571454437. The reversal of 91571454361 is 16345417519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68614659136 + 22956795225 = 261944^2 + 151515^2 .

It is a cyclic number.

It is not a de Polignac number, because 91571454361 - 2²⁷ = 91437236633 is a prime.

It is not a weakly prime, because it can be changed into another prime (91571455361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45785727180 + 45785727181.

It is an arithmetic number, because the mean of its divisors is an integer number (45785727181).

Almost surely, 2^91571454361 is an apocalyptic number.

It is an amenable number.

91571454361 is a deficient number, since it is larger than the sum of its proper divisors (1).

91571454361 is an equidigital number, since it uses as much as digits as its factorization.

91571454361 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 91571454361 in words is "ninety-one billion, five hundred seventy-one million, four hundred fifty-four thousand, three hundred sixty-one".