91779058837 has 2 divisors, whose sum is σ = 91779058838. Its totient is φ = 91779058836.

The previous prime is 91779058793. The next prime is 91779058841. The reversal of 91779058837 is 73885097719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64251603441 + 27527455396 = 253479^2 + 165914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91779058837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91779058897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45889529418 + 45889529419.

It is an arithmetic number, because the mean of its divisors is an integer number (45889529419).

Almost surely, 2^91779058837 is an apocalyptic number.

It is an amenable number.

91779058837 is a deficient number, since it is larger than the sum of its proper divisors (1).

91779058837 is an equidigital number, since it uses as much as digits as its factorization.

91779058837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 91779058837 in words is "ninety-one billion, seven hundred seventy-nine million, fifty-eight thousand, eight hundred thirty-seven".