999959 has 2 divisors, whose sum is σ = 999960. Its totient is φ = 999958.

The previous prime is 999953. The next prime is 999961. The reversal of 999959 is 959999.

999959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999959 is a prime.

Together with 999961, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999953) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499979 + 499980.

It is an arithmetic number, because the mean of its divisors is an integer number (499980).

2⁹⁹⁹⁹⁵⁹ is an apocalyptic number.

999959 is a deficient number, since it is larger than the sum of its proper divisors (1).

999959 is an equidigital number, since it uses as much as digits as its factorization.

999959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 295245, while the sum is 50.

The square root of 999959 is about 999.9794997899. The cubic root of 999959 is about 99.9986333147.

The spelling of 999959 in words is "nine hundred ninety-nine thousand, nine hundred fifty-nine".