91859695859 has 2 divisors, whose sum is σ = 91859695860. Its totient is φ = 91859695858.

The previous prime is 91859695817. The next prime is 91859695913. The reversal of 91859695859 is 95859695819.

It is a weak prime.

It is an emirp because it is prime and its reverse (95859695819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91859695859 - 2¹⁶ = 91859630323 is a prime.

It is not a weakly prime, because it can be changed into another prime (91859695159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45929847929 + 45929847930.

It is an arithmetic number, because the mean of its divisors is an integer number (45929847930).

Almost surely, 2^91859695859 is an apocalyptic number.

91859695859 is a deficient number, since it is larger than the sum of its proper divisors (1).

91859695859 is an equidigital number, since it uses as much as digits as its factorization.

91859695859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928000, while the sum is 74.

The spelling of 91859695859 in words is "ninety-one billion, eight hundred fifty-nine million, six hundred ninety-five thousand, eight hundred fifty-nine".