508856813 has 2 divisors, whose sum is σ = 508856814. Its totient is φ = 508856812.

The previous prime is 508856773. The next prime is 508856861. The reversal of 508856813 is 318658805.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496487524 + 12369289 = 22282^2 + 3517^2 .

It is a cyclic number.

It is not a de Polignac number, because 508856813 - 2⁶ = 508856749 is a prime.

It is a super-2 number, since 2×508856813² = 517870512273033938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (508856113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254428406 + 254428407.

It is an arithmetic number, because the mean of its divisors is an integer number (254428407).

Almost surely, 2^508856813 is an apocalyptic number.

It is an amenable number.

508856813 is a deficient number, since it is larger than the sum of its proper divisors (1).

508856813 is an equidigital number, since it uses as much as digits as its factorization.

508856813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 44.

The square root of 508856813 is about 22557.8547960572. The cubic root of 508856813 is about 798.3595619404.

The spelling of 508856813 in words is "five hundred eight million, eight hundred fifty-six thousand, eight hundred thirteen".