694563689 has 2 divisors, whose sum is σ = 694563690. Its totient is φ = 694563688.

The previous prime is 694563631. The next prime is 694563691. The reversal of 694563689 is 986365496.

694563689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649230400 + 45333289 = 25480^2 + 6733^2 .

It is a cyclic number.

It is not a de Polignac number, because 694563689 - 2¹⁶ = 694498153 is a prime.

Together with 694563691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (694563619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347281844 + 347281845.

It is an arithmetic number, because the mean of its divisors is an integer number (347281845).

Almost surely, 2^694563689 is an apocalyptic number.

It is an amenable number.

694563689 is a deficient number, since it is larger than the sum of its proper divisors (1).

694563689 is an equidigital number, since it uses as much as digits as its factorization.

694563689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 56.

The square root of 694563689 is about 26354.5762439846. The cubic root of 694563689 is about 885.5994912508.

The spelling of 694563689 in words is "six hundred ninety-four million, five hundred sixty-three thousand, six hundred eighty-nine".