508909 has 2 divisors, whose sum is σ = 508910. Its totient is φ = 508908.

The previous prime is 508903. The next prime is 508913. The reversal of 508909 is 909805.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366025 + 142884 = 605^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 508909 - 2³ = 508901 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (508901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254454 + 254455.

It is an arithmetic number, because the mean of its divisors is an integer number (254455).

2⁵⁰⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

508909 is a deficient number, since it is larger than the sum of its proper divisors (1).

508909 is an equidigital number, since it uses as much as digits as its factorization.

508909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 508909 is about 713.3785811195. The cubic root of 508909 is about 79.8386853551.

The spelling of 508909 in words is "five hundred eight thousand, nine hundred nine".