696890209 has 2 divisors, whose sum is σ = 696890210. Its totient is φ = 696890208.

The previous prime is 696890119. The next prime is 696890297. The reversal of 696890209 is 902098696.

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., 681366609 + 15523600 = 26103^2 + 3940^2 .

It is a cyclic number.

It is not a de Polignac number, because 696890209 - 2⁷ = 696890081 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (696893209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348445104 + 348445105.

It is an arithmetic number, because the mean of its divisors is an integer number (348445105).

Almost surely, 2^696890209 is an apocalyptic number.

It is an amenable number.

696890209 is a deficient number, since it is larger than the sum of its proper divisors (1).

696890209 is an equidigital number, since it uses as much as digits as its factorization.

696890209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 696890209 is about 26398.6781676659. The cubic root of 696890209 is about 886.5871946378.

The spelling of 696890209 in words is "six hundred ninety-six million, eight hundred ninety thousand, two hundred nine".