509471189 has 2 divisors, whose sum is σ = 509471190. Its totient is φ = 509471188.

The previous prime is 509471173. The next prime is 509471227. The reversal of 509471189 is 981174905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434388964 + 75082225 = 20842^2 + 8665^2 .

It is a cyclic number.

It is not a de Polignac number, because 509471189 - 2⁴ = 509471173 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 (509471119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254735594 + 254735595.

It is an arithmetic number, because the mean of its divisors is an integer number (254735595).

Almost surely, 2^509471189 is an apocalyptic number.

It is an amenable number.

509471189 is a deficient number, since it is larger than the sum of its proper divisors (1).

509471189 is an equidigital number, since it uses as much as digits as its factorization.

509471189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 509471189 is about 22571.4684723879. The cubic root of 509471189 is about 798.6807365634.

The spelling of 509471189 in words is "five hundred nine million, four hundred seventy-one thousand, one hundred eighty-nine".