696917909 has 2 divisors, whose sum is σ = 696917910. Its totient is φ = 696917908.

The previous prime is 696917869. The next prime is 696917957. The reversal of 696917909 is 909719696.

It is a happy number.

696917909 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., 696432100 + 485809 = 26390^2 + 697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-696917909 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (696917999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348458954 + 348458955.

It is an arithmetic number, because the mean of its divisors is an integer number (348458955).

Almost surely, 2^696917909 is an apocalyptic number.

It is an amenable number.

696917909 is a deficient number, since it is larger than the sum of its proper divisors (1).

696917909 is an equidigital number, since it uses as much as digits as its factorization.

696917909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1653372, while the sum is 56.

The square root of 696917909 is about 26399.2028099335. The cubic root of 696917909 is about 886.5989411748.

The spelling of 696917909 in words is "six hundred ninety-six million, nine hundred seventeen thousand, nine hundred nine".