509545903 has 2 divisors, whose sum is σ = 509545904. Its totient is φ = 509545902.

The previous prime is 509545901. The next prime is 509545919. The reversal of 509545903 is 309545905.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509545903 - 2¹ = 509545901 is a prime.

Together with 509545901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509545901) 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, 254772951 + 254772952.

It is an arithmetic number, because the mean of its divisors is an integer number (254772952).

Almost surely, 2^509545903 is an apocalyptic number.

509545903 is a deficient number, since it is larger than the sum of its proper divisors (1).

509545903 is an equidigital number, since it uses as much as digits as its factorization.

509545903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 509545903 is about 22573.1234657501. The cubic root of 509545903 is about 798.7197768579.

The spelling of 509545903 in words is "five hundred nine million, five hundred forty-five thousand, nine hundred three".