690769309 has 2 divisors, whose sum is σ = 690769310. Its totient is φ = 690769308.

The previous prime is 690769291. The next prime is 690769333. The reversal of 690769309 is 903967096.

690769309 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., 685916100 + 4853209 = 26190^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 690769309 - 2⁷ = 690769181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690769349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345384654 + 345384655.

It is an arithmetic number, because the mean of its divisors is an integer number (345384655).

Almost surely, 2^690769309 is an apocalyptic number.

It is an amenable number.

690769309 is a deficient number, since it is larger than the sum of its proper divisors (1).

690769309 is an equidigital number, since it uses as much as digits as its factorization.

690769309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 690769309 is about 26282.4905402818. The cubic root of 690769309 is about 883.9838780903.

The spelling of 690769309 in words is "six hundred ninety million, seven hundred sixty-nine thousand, three hundred nine".