91939059697 has 2 divisors, whose sum is σ = 91939059698. Its totient is φ = 91939059696.

The previous prime is 91939059691. The next prime is 91939059713. The reversal of 91939059697 is 79695093919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54847766416 + 37091293281 = 234196^2 + 192591^2 .

It is a cyclic number.

It is not a de Polignac number, because 91939059697 - 2²⁷ = 91804841969 is a prime.

It is not a weakly prime, because it can be changed into another prime (91939059691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45969529848 + 45969529849.

It is an arithmetic number, because the mean of its divisors is an integer number (45969529849).

Almost surely, 2^91939059697 is an apocalyptic number.

It is an amenable number.

91939059697 is a deficient number, since it is larger than the sum of its proper divisors (1).

91939059697 is an equidigital number, since it uses as much as digits as its factorization.

91939059697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37200870, while the sum is 67.

The spelling of 91939059697 in words is "ninety-one billion, nine hundred thirty-nine million, fifty-nine thousand, six hundred ninety-seven".