696889909 has 2 divisors, whose sum is σ = 696889910. Its totient is φ = 696889908.

The previous prime is 696889883. The next prime is 696889913. The reversal of 696889909 is 909988696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469935684 + 226954225 = 21678^2 + 15065^2 .

It is a cyclic number.

It is not a de Polignac number, because 696889909 - 2¹⁵ = 696857141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (696889969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348444954 + 348444955.

It is an arithmetic number, because the mean of its divisors is an integer number (348444955).

Almost surely, 2^696889909 is an apocalyptic number.

It is an amenable number.

696889909 is a deficient number, since it is larger than the sum of its proper divisors (1).

696889909 is an equidigital number, since it uses as much as digits as its factorization.

696889909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15116544, while the sum is 64.

The square root of 696889909 is about 26398.6724855626. The cubic root of 696889909 is about 886.5870674173.

It can be divided in two parts, 69688 and 9909, that added together give a palindrome (79597).

The spelling of 696889909 in words is "six hundred ninety-six million, eight hundred eighty-nine thousand, nine hundred nine".