689568449 has 2 divisors, whose sum is σ = 689568450. Its totient is φ = 689568448.

The previous prime is 689568431. The next prime is 689568533. The reversal of 689568449 is 944865986.

689568449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381811600 + 307756849 = 19540^2 + 17543^2 .

It is a cyclic number.

It is not a de Polignac number, because 689568449 - 2⁸ = 689568193 is a prime.

It is not a weakly prime, because it can be changed into another prime (689565449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344784224 + 344784225.

It is an arithmetic number, because the mean of its divisors is an integer number (344784225).

Almost surely, 2^689568449 is an apocalyptic number.

It is an amenable number.

689568449 is a deficient number, since it is larger than the sum of its proper divisors (1).

689568449 is an equidigital number, since it uses as much as digits as its factorization.

689568449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14929920, while the sum is 59.

The square root of 689568449 is about 26259.6353554272. The cubic root of 689568449 is about 883.4713304124.

The spelling of 689568449 in words is "six hundred eighty-nine million, five hundred sixty-eight thousand, four hundred forty-nine".