91170256523 has 2 divisors, whose sum is σ = 91170256524. Its totient is φ = 91170256522.

The previous prime is 91170256517. The next prime is 91170256543. The reversal of 91170256523 is 32565207119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91170256523 - 2²⁶ = 91103147659 is a prime.

It is not a weakly prime, because it can be changed into another prime (91170256543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45585128261 + 45585128262.

It is an arithmetic number, because the mean of its divisors is an integer number (45585128262).

Almost surely, 2^91170256523 is an apocalyptic number.

91170256523 is a deficient number, since it is larger than the sum of its proper divisors (1).

91170256523 is an equidigital number, since it uses as much as digits as its factorization.

91170256523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 91170256523 in words is "ninety-one billion, one hundred seventy million, two hundred fifty-six thousand, five hundred twenty-three".