509139641 has 2 divisors, whose sum is σ = 509139642. Its totient is φ = 509139640.

The previous prime is 509139623. The next prime is 509139643. The reversal of 509139641 is 146931905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453860416 + 55279225 = 21304^2 + 7435^2 .

It is a cyclic number.

It is not a de Polignac number, because 509139641 - 2⁶ = 509139577 is a prime.

Together with 509139643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 509139595 and 509139604.

It is not a weakly prime, because it can be changed into another prime (509139643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254569820 + 254569821.

It is an arithmetic number, because the mean of its divisors is an integer number (254569821).

Almost surely, 2^509139641 is an apocalyptic number.

It is an amenable number.

509139641 is a deficient number, since it is larger than the sum of its proper divisors (1).

509139641 is an equidigital number, since it uses as much as digits as its factorization.

509139641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 509139641 is about 22564.1228723831. The cubic root of 509139641 is about 798.5074467754.

The spelling of 509139641 in words is "five hundred nine million, one hundred thirty-nine thousand, six hundred forty-one".