508856861 has 2 divisors, whose sum is σ = 508856862. Its totient is φ = 508856860.

The previous prime is 508856813. The next prime is 508856891. The reversal of 508856861 is 168658805.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412699225 + 96157636 = 20315^2 + 9806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-508856861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (508856891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254428430 + 254428431.

It is an arithmetic number, because the mean of its divisors is an integer number (254428431).

Almost surely, 2^508856861 is an apocalyptic number.

It is an amenable number.

508856861 is a deficient number, since it is larger than the sum of its proper divisors (1).

508856861 is an equidigital number, since it uses as much as digits as its factorization.

508856861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 47.

The square root of 508856861 is about 22557.8558599881. The cubic root of 508856861 is about 798.3595870433.

The spelling of 508856861 in words is "five hundred eight million, eight hundred fifty-six thousand, eight hundred sixty-one".