91693892309 has 2 divisors, whose sum is σ = 91693892310. Its totient is φ = 91693892308.

The previous prime is 91693892249. The next prime is 91693892393. The reversal of 91693892309 is 90329839619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78314343409 + 13379548900 = 279847^2 + 115670^2 .

It is an emirp because it is prime and its reverse (90329839619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91693892309 - 2²⁰ = 91692843733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91693892009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45846946154 + 45846946155.

It is an arithmetic number, because the mean of its divisors is an integer number (45846946155).

Almost surely, 2^91693892309 is an apocalyptic number.

It is an amenable number.

91693892309 is a deficient number, since it is larger than the sum of its proper divisors (1).

91693892309 is an equidigital number, since it uses as much as digits as its factorization.

91693892309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5668704, while the sum is 59.

The spelling of 91693892309 in words is "ninety-one billion, six hundred ninety-three million, eight hundred ninety-two thousand, three hundred nine".