697966609 has 2 divisors, whose sum is σ = 697966610. Its totient is φ = 697966608.

The previous prime is 697966601. The next prime is 697966613. The reversal of 697966609 is 906669796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519156225 + 178810384 = 22785^2 + 13372^2 .

It is a cyclic number.

It is not a de Polignac number, because 697966609 - 2³ = 697966601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (697966601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348983304 + 348983305.

It is an arithmetic number, because the mean of its divisors is an integer number (348983305).

Almost surely, 2^697966609 is an apocalyptic number.

It is an amenable number.

697966609 is a deficient number, since it is larger than the sum of its proper divisors (1).

697966609 is an equidigital number, since it uses as much as digits as its factorization.

697966609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 58.

The square root of 697966609 is about 26419.0576856935. The cubic root of 697966609 is about 887.0434269701.

The spelling of 697966609 in words is "six hundred ninety-seven million, nine hundred sixty-six thousand, six hundred nine".