509433391 has 2 divisors, whose sum is σ = 509433392. Its totient is φ = 509433390.

The previous prime is 509433359. The next prime is 509433437. The reversal of 509433391 is 193334905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509433391 - 2⁵ = 509433359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 509433391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509437391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254716695 + 254716696.

It is an arithmetic number, because the mean of its divisors is an integer number (254716696).

Almost surely, 2^509433391 is an apocalyptic number.

509433391 is a deficient number, since it is larger than the sum of its proper divisors (1).

509433391 is an equidigital number, since it uses as much as digits as its factorization.

509433391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 509433391 is about 22570.6311608692. The cubic root of 509433391 is about 798.6609845265.

The spelling of 509433391 in words is "five hundred nine million, four hundred thirty-three thousand, three hundred ninety-one".