809401613 has 2 divisors, whose sum is σ = 809401614. Its totient is φ = 809401612.

The previous prime is 809401601. The next prime is 809401639. The reversal of 809401613 is 316104908.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755040484 + 54361129 = 27478^2 + 7373^2 .

It is a cyclic number.

It is not a de Polignac number, because 809401613 - 2²⁰ = 808353037 is a prime.

It is a super-2 number, since 2×809401613² = 1310261942254003538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 809401613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809401643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404700806 + 404700807.

It is an arithmetic number, because the mean of its divisors is an integer number (404700807).

Almost surely, 2^809401613 is an apocalyptic number.

It is an amenable number.

809401613 is a deficient number, since it is larger than the sum of its proper divisors (1).

809401613 is an equidigital number, since it uses as much as digits as its factorization.

809401613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 809401613 is about 28449.9844112435. The cubic root of 809401613 is about 931.9401486276.

The spelling of 809401613 in words is "eight hundred nine million, four hundred one thousand, six hundred thirteen".