91175285791 has 2 divisors, whose sum is σ = 91175285792. Its totient is φ = 91175285790.

The previous prime is 91175285651. The next prime is 91175285801. The reversal of 91175285791 is 19758257119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91175285791 - 2¹¹ = 91175283743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91175285191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45587642895 + 45587642896.

It is an arithmetic number, because the mean of its divisors is an integer number (45587642896).

Almost surely, 2^91175285791 is an apocalyptic number.

91175285791 is a deficient number, since it is larger than the sum of its proper divisors (1).

91175285791 is an equidigital number, since it uses as much as digits as its factorization.

91175285791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 55.

The spelling of 91175285791 in words is "ninety-one billion, one hundred seventy-five million, two hundred eighty-five thousand, seven hundred ninety-one".