809612613 has 6 divisors (see below), whose sum is σ = 1169440454. Its totient is φ = 539741736.

The previous prime is 809612603. The next prime is 809612621. The reversal of 809612613 is 316216908.

It can be written as a sum of positive squares in only one way, i.e., 522716769 + 286895844 = 22863^2 + 16938^2 .

It is not a de Polignac number, because 809612613 - 2²⁵ = 776058181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809612603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44978470 + ... + 44978487.

Almost surely, 2^809612613 is an apocalyptic number.

It is an amenable number.

809612613 is a deficient number, since it is larger than the sum of its proper divisors (359827841).

809612613 is a wasteful number, since it uses less digits than its factorization.

809612613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89956963 (or 89956960 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 809612613 is about 28453.6924317390. The cubic root of 809612613 is about 932.0211229686.

The spelling of 809612613 in words is "eight hundred nine million, six hundred twelve thousand, six hundred thirteen".