659999 has 2 divisors, whose sum is σ = 660000. Its totient is φ = 659998.

The previous prime is 659983. The next prime is 660001. The reversal of 659999 is 999956.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 659999 - 2⁴ = 659983 is a prime.

Together with 660001, it forms a pair of twin primes.

It is a Chen prime.

659999 is a modest number, since divided by 999 gives 659 as remainder.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 659999.

It is not a weakly prime, because it can be changed into another prime (659299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329999 + 330000.

It is an arithmetic number, because the mean of its divisors is an integer number (330000).

2⁶⁵⁹⁹⁹⁹ is an apocalyptic number.

659999 is a deficient number, since it is larger than the sum of its proper divisors (1).

659999 is an equidigital number, since it uses as much as digits as its factorization.

659999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 47.

The square root of 659999 is about 812.4032250059. The cubic root of 659999 is about 87.0658329390.

The spelling of 659999 in words is "six hundred fifty-nine thousand, nine hundred ninety-nine".