695669309 has 2 divisors, whose sum is σ = 695669310. Its totient is φ = 695669308.

The previous prime is 695669267. The next prime is 695669311. The reversal of 695669309 is 903966596.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621106084 + 74563225 = 24922^2 + 8635^2 .

It is a cyclic number.

It is not a de Polignac number, because 695669309 - 2¹² = 695665213 is a prime.

Together with 695669311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (695669209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347834654 + 347834655.

It is an arithmetic number, because the mean of its divisors is an integer number (347834655).

Almost surely, 2^695669309 is an apocalyptic number.

It is an amenable number.

695669309 is a deficient number, since it is larger than the sum of its proper divisors (1).

695669309 is an equidigital number, since it uses as much as digits as its factorization.

695669309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 53.

The square root of 695669309 is about 26375.5437669065. The cubic root of 695669309 is about 886.0691469727.

The spelling of 695669309 in words is "six hundred ninety-five million, six hundred sixty-nine thousand, three hundred nine".