85813491217 has 2 divisors, whose sum is σ = 85813491218. Its totient is φ = 85813491216.

The previous prime is 85813491151. The next prime is 85813491223. The reversal of 85813491217 is 71219431858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56446157056 + 29367334161 = 237584^2 + 171369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85813491217 is a prime.

It is a super-2 number, since 2×85813491217² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85813492217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42906745608 + 42906745609.

It is an arithmetic number, because the mean of its divisors is an integer number (42906745609).

Almost surely, 2^85813491217 is an apocalyptic number.

It is an amenable number.

85813491217 is a deficient number, since it is larger than the sum of its proper divisors (1).

85813491217 is an equidigital number, since it uses as much as digits as its factorization.

85813491217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The spelling of 85813491217 in words is "eighty-five billion, eight hundred thirteen million, four hundred ninety-one thousand, two hundred seventeen".