813687026209 has 2 divisors, whose sum is σ = 813687026210. Its totient is φ = 813687026208.

The previous prime is 813687026161. The next prime is 813687026219. The reversal of 813687026209 is 902620786318.

813687026209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743652696609 + 70034329600 = 862353^2 + 264640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813687026209 is a prime.

It is not a weakly prime, because it can be changed into another prime (813687026219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406843513104 + 406843513105.

It is an arithmetic number, because the mean of its divisors is an integer number (406843513105).

Almost surely, 2^813687026209 is an apocalyptic number.

It is an amenable number.

813687026209 is a deficient number, since it is larger than the sum of its proper divisors (1).

813687026209 is an equidigital number, since it uses as much as digits as its factorization.

813687026209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 813687026209 in words is "eight hundred thirteen billion, six hundred eighty-seven million, twenty-six thousand, two hundred nine".