683665609 has 9 divisors (see below), whose sum is σ = 751783431. Its totient is φ = 621252720.

The previous prime is 683665597. The next prime is 683665621. The reversal of 683665609 is 906566386.

The square root of 683665609 is 26147.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (683665597) and next prime (683665621).

It can be written as a sum of positive squares in only one way, i.e., 270438025 + 413227584 = 16445^2 + 20328^2 .

It is not a de Polignac number, because 683665609 - 2²⁷ = 549447881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (683665669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 286429 + ... + 288805.

Almost surely, 2^683665609 is an apocalyptic number.

683665609 is the 26147-th square number.

683665609 is the 13074-th centered octagonal number.

It is an amenable number.

683665609 is a deficient number, since it is larger than the sum of its proper divisors (68117822).

683665609 is an frugal number, since it uses more digits than its factorization.

683665609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The cubic root of 683665609 is about 880.9432074340.

Multiplying 683665609 by its sum of digits (49), we get a square (33499614841 = 183029²).

The spelling of 683665609 in words is "six hundred eighty-three million, six hundred sixty-five thousand, six hundred nine".