690808999 has 2 divisors, whose sum is σ = 690809000. Its totient is φ = 690808998.

The previous prime is 690808997. The next prime is 690809003. The reversal of 690808999 is 999808096.

690808999 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 is a cyclic number.

It is not a de Polignac number, because 690808999 - 2¹ = 690808997 is a prime.

Together with 690808997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690808997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345404499 + 345404500.

It is an arithmetic number, because the mean of its divisors is an integer number (345404500).

Almost surely, 2^690808999 is an apocalyptic number.

690808999 is a deficient number, since it is larger than the sum of its proper divisors (1).

690808999 is an equidigital number, since it uses as much as digits as its factorization.

690808999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 58.

The square root of 690808999 is about 26283.2455948652. The cubic root of 690808999 is about 884.0008083195. Note that the first 3 decimals are identical.

The spelling of 690808999 in words is "six hundred ninety million, eight hundred eight thousand, nine hundred ninety-nine".