91559559193 has 2 divisors, whose sum is σ = 91559559194. Its totient is φ = 91559559192.

The previous prime is 91559559167. The next prime is 91559559199. The reversal of 91559559193 is 39195595519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48864428809 + 42695130384 = 221053^2 + 206628^2 .

It is a cyclic number.

It is not a de Polignac number, because 91559559193 - 2¹³ = 91559551001 is a prime.

It is a super-2 number, since 2×91559559193² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91559559199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45779779596 + 45779779597.

It is an arithmetic number, because the mean of its divisors is an integer number (45779779597).

Almost surely, 2^91559559193 is an apocalyptic number.

It is an amenable number.

91559559193 is a deficient number, since it is larger than the sum of its proper divisors (1).

91559559193 is an equidigital number, since it uses as much as digits as its factorization.

91559559193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12301875, while the sum is 61.

The spelling of 91559559193 in words is "ninety-one billion, five hundred fifty-nine million, five hundred fifty-nine thousand, one hundred ninety-three".