690079889 has 2 divisors, whose sum is σ = 690079890. Its totient is φ = 690079888.

The previous prime is 690079811. The next prime is 690079891. The reversal of 690079889 is 988970096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539772289 + 150307600 = 23233^2 + 12260^2 .

It is a cyclic number.

It is not a de Polignac number, because 690079889 - 2⁸ = 690079633 is a prime.

Together with 690079891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690079289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345039944 + 345039945.

It is an arithmetic number, because the mean of its divisors is an integer number (345039945).

Almost surely, 2^690079889 is an apocalyptic number.

It is an amenable number.

690079889 is a deficient number, since it is larger than the sum of its proper divisors (1).

690079889 is an equidigital number, since it uses as much as digits as its factorization.

690079889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 690079889 is about 26269.3716902403. The cubic root of 690079889 is about 883.6896944806.

The spelling of 690079889 in words is "six hundred ninety million, seventy-nine thousand, eight hundred eighty-nine".