91137785839 has 2 divisors, whose sum is σ = 91137785840. Its totient is φ = 91137785838.

The previous prime is 91137785833. The next prime is 91137785897. The reversal of 91137785839 is 93858773119.

It is a weak prime.

It is an emirp because it is prime and its reverse (93858773119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91137785839 - 2¹¹ = 91137783791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91137785833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45568892919 + 45568892920.

It is an arithmetic number, because the mean of its divisors is an integer number (45568892920).

Almost surely, 2^91137785839 is an apocalyptic number.

91137785839 is a deficient number, since it is larger than the sum of its proper divisors (1).

91137785839 is an equidigital number, since it uses as much as digits as its factorization.

91137785839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 61.

The spelling of 91137785839 in words is "ninety-one billion, one hundred thirty-seven million, seven hundred eighty-five thousand, eight hundred thirty-nine".