694443689 has 2 divisors, whose sum is σ = 694443690. Its totient is φ = 694443688.

The previous prime is 694443641. The next prime is 694443751. The reversal of 694443689 is 986344496.

694443689 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., 636805225 + 57638464 = 25235^2 + 7592^2 .

It is a cyclic number.

It is not a de Polignac number, because 694443689 - 2⁸ = 694443433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 694443689.

It is not a weakly prime, because it can be changed into another prime (694443619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347221844 + 347221845.

It is an arithmetic number, because the mean of its divisors is an integer number (347221845).

Almost surely, 2^694443689 is an apocalyptic number.

It is an amenable number.

694443689 is a deficient number, since it is larger than the sum of its proper divisors (1).

694443689 is an equidigital number, since it uses as much as digits as its factorization.

694443689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 53.

The square root of 694443689 is about 26352.2995011821. The cubic root of 694443689 is about 885.5484865403.

The spelling of 694443689 in words is "six hundred ninety-four million, four hundred forty-three thousand, six hundred eighty-nine".