817339649 has 12 divisors (see below), whose sum is σ = 957172500. Its totient is φ = 695868768.

The previous prime is 817339643. The next prime is 817339667. The reversal of 817339649 is 946933718.

It can be written as a sum of positive squares in 2 ways, for example, as 32947600 + 784392049 = 5740^2 + 28007^2 .

It is not a de Polignac number, because 817339649 - 2²⁸ = 548904193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 817339597 and 817339606.

It is not an unprimeable number, because it can be changed into a prime (817339643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48674 + ... + 63275.

It is an arithmetic number, because the mean of its divisors is an integer number (79764375).

Almost surely, 2^817339649 is an apocalyptic number.

It is an amenable number.

817339649 is a deficient number, since it is larger than the sum of its proper divisors (139832851).

817339649 is a wasteful number, since it uses less digits than its factorization.

817339649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112112 (or 112105 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 817339649 is about 28589.1526457151. The cubic root of 817339649 is about 934.9768452043.

The spelling of 817339649 in words is "eight hundred seventeen million, three hundred thirty-nine thousand, six hundred forty-nine".