638600803 has 2 divisors, whose sum is σ = 638600804. Its totient is φ = 638600802.

The previous prime is 638600791. The next prime is 638600813. The reversal of 638600803 is 308006836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638600803 is a prime.

It is not a weakly prime, because it can be changed into another prime (638600813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319300401 + 319300402.

It is an arithmetic number, because the mean of its divisors is an integer number (319300402).

Almost surely, 2^638600803 is an apocalyptic number.

638600803 is a deficient number, since it is larger than the sum of its proper divisors (1).

638600803 is an equidigital number, since it uses as much as digits as its factorization.

638600803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 638600803 is about 25270.5520913177. The cubic root of 638600803 is about 861.1454014245.

The spelling of 638600803 in words is "six hundred thirty-eight million, six hundred thousand, eight hundred three".