503681609 has 2 divisors, whose sum is σ = 503681610. Its totient is φ = 503681608.

The previous prime is 503681579. The next prime is 503681653. The reversal of 503681609 is 906186305.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448253584 + 55428025 = 21172^2 + 7445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-503681609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (503684609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251840804 + 251840805.

It is an arithmetic number, because the mean of its divisors is an integer number (251840805).

Almost surely, 2^503681609 is an apocalyptic number.

It is an amenable number.

503681609 is a deficient number, since it is larger than the sum of its proper divisors (1).

503681609 is an equidigital number, since it uses as much as digits as its factorization.

503681609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 503681609 is about 22442.8520692001. The cubic root of 503681609 is about 795.6438274424.

The spelling of 503681609 in words is "five hundred three million, six hundred eighty-one thousand, six hundred nine".