91712061313 has 2 divisors, whose sum is σ = 91712061314. Its totient is φ = 91712061312.

The previous prime is 91712061299. The next prime is 91712061319. The reversal of 91712061313 is 31316021719.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83924351809 + 7787709504 = 289697^2 + 88248^2 .

It is a cyclic number.

It is not a de Polignac number, because 91712061313 - 2⁵ = 91712061281 is a prime.

It is a super-2 number, since 2×91712061313² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91712061319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45856030656 + 45856030657.

It is an arithmetic number, because the mean of its divisors is an integer number (45856030657).

Almost surely, 2^91712061313 is an apocalyptic number.

It is an amenable number.

91712061313 is a deficient number, since it is larger than the sum of its proper divisors (1).

91712061313 is an equidigital number, since it uses as much as digits as its factorization.

91712061313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 91712061313 in words is "ninety-one billion, seven hundred twelve million, sixty-one thousand, three hundred thirteen".