509947211 has 2 divisors, whose sum is σ = 509947212. Its totient is φ = 509947210.

The previous prime is 509947187. The next prime is 509947219. The reversal of 509947211 is 112749905.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509947211 is a prime.

It is not a weakly prime, because it can be changed into another prime (509947219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254973605 + 254973606.

It is an arithmetic number, because the mean of its divisors is an integer number (254973606).

Almost surely, 2^509947211 is an apocalyptic number.

509947211 is a deficient number, since it is larger than the sum of its proper divisors (1).

509947211 is an equidigital number, since it uses as much as digits as its factorization.

509947211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 509947211 is about 22582.0107829219. The cubic root of 509947211 is about 798.9294069899.

The spelling of 509947211 in words is "five hundred nine million, nine hundred forty-seven thousand, two hundred eleven".