685832449 has 2 divisors, whose sum is σ = 685832450. Its totient is φ = 685832448.

The previous prime is 685832431. The next prime is 685832453. The reversal of 685832449 is 944238586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612216049 + 73616400 = 24743^2 + 8580^2 .

It is a cyclic number.

It is not a de Polignac number, because 685832449 - 2⁷ = 685832321 is a prime.

It is a super-2 number, since 2×685832449² = 940732296202675202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (685832419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342916224 + 342916225.

It is an arithmetic number, because the mean of its divisors is an integer number (342916225).

Almost surely, 2^685832449 is an apocalyptic number.

It is an amenable number.

685832449 is a deficient number, since it is larger than the sum of its proper divisors (1).

685832449 is an equidigital number, since it uses as much as digits as its factorization.

685832449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 49.

The square root of 685832449 is about 26188.4029486336. The cubic root of 685832449 is about 881.8729260078.

The spelling of 685832449 in words is "six hundred eighty-five million, eight hundred thirty-two thousand, four hundred forty-nine".