91779897719 has 2 divisors, whose sum is σ = 91779897720. Its totient is φ = 91779897718.

The previous prime is 91779897683. The next prime is 91779897739.

91779897719 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 91779897719 - 2²⁴ = 91763120503 is a prime.

It is a super-2 number, since 2×91779897719² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91779897739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45889948859 + 45889948860.

It is an arithmetic number, because the mean of its divisors is an integer number (45889948860).

Almost surely, 2^91779897719 is an apocalyptic number.

91779897719 is a deficient number, since it is larger than the sum of its proper divisors (1).

91779897719 is an equidigital number, since it uses as much as digits as its factorization.

91779897719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126023688, while the sum is 74.

The spelling of 91779897719 in words is "ninety-one billion, seven hundred seventy-nine million, eight hundred ninety-seven thousand, seven hundred nineteen".