91777426313 has 2 divisors, whose sum is σ = 91777426314. Its totient is φ = 91777426312.

The previous prime is 91777426249. The next prime is 91777426327. The reversal of 91777426313 is 31362477719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89226469264 + 2550957049 = 298708^2 + 50507^2 .

It is a cyclic number.

It is not a de Polignac number, because 91777426313 - 2⁶ = 91777426249 is a prime.

It is not a weakly prime, because it can be changed into another prime (91777423313) 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, 45888713156 + 45888713157.

It is an arithmetic number, because the mean of its divisors is an integer number (45888713157).

Almost surely, 2^91777426313 is an apocalyptic number.

It is an amenable number.

91777426313 is a deficient number, since it is larger than the sum of its proper divisors (1).

91777426313 is an equidigital number, since it uses as much as digits as its factorization.

91777426313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 50.

The spelling of 91777426313 in words is "ninety-one billion, seven hundred seventy-seven million, four hundred twenty-six thousand, three hundred thirteen".