684590089 has 2 divisors, whose sum is σ = 684590090. Its totient is φ = 684590088.

The previous prime is 684590077. The next prime is 684590099. The reversal of 684590089 is 980095486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599858064 + 84732025 = 24492^2 + 9205^2 .

It is a cyclic number.

It is not a de Polignac number, because 684590089 - 2²⁵ = 651035657 is a prime.

It is not a weakly prime, because it can be changed into another prime (684590069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342295044 + 342295045.

It is an arithmetic number, because the mean of its divisors is an integer number (342295045).

Almost surely, 2^684590089 is an apocalyptic number.

It is an amenable number.

684590089 is a deficient number, since it is larger than the sum of its proper divisors (1).

684590089 is an equidigital number, since it uses as much as digits as its factorization.

684590089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 684590089 is about 26164.6725376031. The cubic root of 684590089 is about 881.3401108063.

The spelling of 684590089 in words is "six hundred eighty-four million, five hundred ninety thousand, eighty-nine".