91557742313 has 2 divisors, whose sum is σ = 91557742314. Its totient is φ = 91557742312.

The previous prime is 91557742273. The next prime is 91557742321. The reversal of 91557742313 is 31324775519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89190627904 + 2367114409 = 298648^2 + 48653^2 .

It is a cyclic number.

It is not a de Polignac number, because 91557742313 - 2²⁶ = 91490633449 is a prime.

It is not a weakly prime, because it can be changed into another prime (91557742343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45778871156 + 45778871157.

It is an arithmetic number, because the mean of its divisors is an integer number (45778871157).

Almost surely, 2^91557742313 is an apocalyptic number.

It is an amenable number.

91557742313 is a deficient number, since it is larger than the sum of its proper divisors (1).

91557742313 is an equidigital number, since it uses as much as digits as its factorization.

91557742313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The spelling of 91557742313 in words is "ninety-one billion, five hundred fifty-seven million, seven hundred forty-two thousand, three hundred thirteen".