690684469 has 2 divisors, whose sum is σ = 690684470. Its totient is φ = 690684468.

The previous prime is 690684461. The next prime is 690684479. The reversal of 690684469 is 964486096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 568250244 + 122434225 = 23838^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 690684469 - 2³ = 690684461 is a prime.

It is a super-2 number, since 2×690684469² = 954090071435623922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690684461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345342234 + 345342235.

It is an arithmetic number, because the mean of its divisors is an integer number (345342235).

Almost surely, 2^690684469 is an apocalyptic number.

It is an amenable number.

690684469 is a deficient number, since it is larger than the sum of its proper divisors (1).

690684469 is an equidigital number, since it uses as much as digits as its factorization.

690684469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The square root of 690684469 is about 26280.8764884279. The cubic root of 690684469 is about 883.9476864308.

It can be divided in two parts, 69068 and 4469, that added together give a palindrome (73537).

The spelling of 690684469 in words is "six hundred ninety million, six hundred eighty-four thousand, four hundred sixty-nine".