697717609 has 2 divisors, whose sum is σ = 697717610. Its totient is φ = 697717608.

The previous prime is 697717597. The next prime is 697717637. The reversal of 697717609 is 906717796.

697717609 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., 472627600 + 225090009 = 21740^2 + 15003^2 .

It is a cyclic number.

It is not a de Polignac number, because 697717609 - 2⁷ = 697717481 is a prime.

It is not a weakly prime, because it can be changed into another prime (697717649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348858804 + 348858805.

It is an arithmetic number, because the mean of its divisors is an integer number (348858805).

Almost surely, 2^697717609 is an apocalyptic number.

It is an amenable number.

697717609 is a deficient number, since it is larger than the sum of its proper divisors (1).

697717609 is an equidigital number, since it uses as much as digits as its factorization.

697717609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000188, while the sum is 52.

The square root of 697717609 is about 26414.3447581044. The cubic root of 697717609 is about 886.9379300016.

The spelling of 697717609 in words is "six hundred ninety-seven million, seven hundred seventeen thousand, six hundred nine".