509947 has 2 divisors, whose sum is σ = 509948. Its totient is φ = 509946.

The previous prime is 509939. The next prime is 509959. The reversal of 509947 is 749905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509947 - 2³ = 509939 is a prime.

It is not a weakly prime, because it can be changed into another prime (509147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254973 + 254974.

It is an arithmetic number, because the mean of its divisors is an integer number (254974).

2⁵⁰⁹⁹⁴⁷ is an apocalyptic number.

509947 is a deficient number, since it is larger than the sum of its proper divisors (1).

509947 is an equidigital number, since it uses as much as digits as its factorization.

509947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 509947 is about 714.1057344679. The cubic root of 509947 is about 79.8929296799.

The spelling of 509947 in words is "five hundred nine thousand, nine hundred forty-seven".