696662009 has 2 divisors, whose sum is σ = 696662010. Its totient is φ = 696662008.

The previous prime is 696661997. The next prime is 696662017. The reversal of 696662009 is 900266696.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684607225 + 12054784 = 26165^2 + 3472^2 .

It is a cyclic number.

It is not a de Polignac number, because 696662009 - 2⁸ = 696661753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (696662069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348331004 + 348331005.

It is an arithmetic number, because the mean of its divisors is an integer number (348331005).

Almost surely, 2^696662009 is an apocalyptic number.

It is an amenable number.

696662009 is a deficient number, since it is larger than the sum of its proper divisors (1).

696662009 is an equidigital number, since it uses as much as digits as its factorization.

696662009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 696662009 is about 26394.3556276716. The cubic root of 696662009 is about 886.4904116808.

The spelling of 696662009 in words is "six hundred ninety-six million, six hundred sixty-two thousand, nine".