91170256511 has 2 divisors, whose sum is σ = 91170256512. Its totient is φ = 91170256510.

The previous prime is 91170256487. The next prime is 91170256517. The reversal of 91170256511 is 11565207119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91170256511 - 2¹⁸ = 91169994367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91170256517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45585128255 + 45585128256.

It is an arithmetic number, because the mean of its divisors is an integer number (45585128256).

Almost surely, 2^91170256511 is an apocalyptic number.

91170256511 is a deficient number, since it is larger than the sum of its proper divisors (1).

91170256511 is an equidigital number, since it uses as much as digits as its factorization.

91170256511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 38.

The spelling of 91170256511 in words is "ninety-one billion, one hundred seventy million, two hundred fifty-six thousand, five hundred eleven".