849781613 has 2 divisors, whose sum is σ = 849781614. Its totient is φ = 849781612.

The previous prime is 849781571. The next prime is 849781619. The reversal of 849781613 is 316187948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 700502089 + 149279524 = 26467^2 + 12218^2 .

It is a cyclic number.

It is not a de Polignac number, because 849781613 - 2²⁶ = 782672749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849781619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424890806 + 424890807.

It is an arithmetic number, because the mean of its divisors is an integer number (424890807).

Almost surely, 2^849781613 is an apocalyptic number.

It is an amenable number.

849781613 is a deficient number, since it is larger than the sum of its proper divisors (1).

849781613 is an equidigital number, since it uses as much as digits as its factorization.

849781613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 849781613 is about 29151.0139274777. The cubic root of 849781613 is about 947.1871043279.

The spelling of 849781613 in words is "eight hundred forty-nine million, seven hundred eighty-one thousand, six hundred thirteen".