503661313 has 2 divisors, whose sum is σ = 503661314. Its totient is φ = 503661312.

The previous prime is 503661307. The next prime is 503661317. The reversal of 503661313 is 313166305.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405096129 + 98565184 = 20127^2 + 9928^2 .

It is a cyclic number.

It is not a de Polignac number, because 503661313 - 2⁵ = 503661281 is a prime.

It is not a weakly prime, because it can be changed into another prime (503661317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251830656 + 251830657.

It is an arithmetic number, because the mean of its divisors is an integer number (251830657).

Almost surely, 2^503661313 is an apocalyptic number.

It is an amenable number.

503661313 is a deficient number, since it is larger than the sum of its proper divisors (1).

503661313 is an equidigital number, since it uses as much as digits as its factorization.

503661313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 503661313 is about 22442.3998939507. The cubic root of 503661313 is about 795.6331403974.

The spelling of 503661313 in words is "five hundred three million, six hundred sixty-one thousand, three hundred thirteen".