509959 has 2 divisors, whose sum is σ = 509960. Its totient is φ = 509958.

The previous prime is 509947. The next prime is 509963. The reversal of 509959 is 959905.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254979 + 254980.

It is an arithmetic number, because the mean of its divisors is an integer number (254980).

2⁵⁰⁹⁹⁵⁹ is an apocalyptic number.

509959 is a deficient number, since it is larger than the sum of its proper divisors (1).

509959 is an equidigital number, since it uses as much as digits as its factorization.

509959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18225, while the sum is 37.

The square root of 509959 is about 714.1141365356. The cubic root of 509959 is about 79.8935563514.

The spelling of 509959 in words is "five hundred nine thousand, nine hundred fifty-nine".