91056808313 has 2 divisors, whose sum is σ = 91056808314. Its totient is φ = 91056808312.

The previous prime is 91056808301. The next prime is 91056808327. The reversal of 91056808313 is 31380865019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70006280569 + 21050527744 = 264587^2 + 145088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91056808313 is a prime.

It is not a weakly prime, because it can be changed into another prime (91056808013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45528404156 + 45528404157.

It is an arithmetic number, because the mean of its divisors is an integer number (45528404157).

Almost surely, 2^91056808313 is an apocalyptic number.

It is an amenable number.

91056808313 is a deficient number, since it is larger than the sum of its proper divisors (1).

91056808313 is an equidigital number, since it uses as much as digits as its factorization.

91056808313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 91056808313 in words is "ninety-one billion, fifty-six million, eight hundred eight thousand, three hundred thirteen".