509129723 has 2 divisors, whose sum is σ = 509129724. Its totient is φ = 509129722.

The previous prime is 509129671. The next prime is 509129737. The reversal of 509129723 is 327921905.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 509129723 - 2¹⁶ = 509064187 is a prime.

It is not a weakly prime, because it can be changed into another prime (509129773) 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, 254564861 + 254564862.

It is an arithmetic number, because the mean of its divisors is an integer number (254564862).

Almost surely, 2^509129723 is an apocalyptic number.

509129723 is a deficient number, since it is larger than the sum of its proper divisors (1).

509129723 is an equidigital number, since it uses as much as digits as its factorization.

509129723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 509129723 is about 22563.9030976469. The cubic root of 509129723 is about 798.5022617877.

The spelling of 509129723 in words is "five hundred nine million, one hundred twenty-nine thousand, seven hundred twenty-three".