638809103 has 2 divisors, whose sum is σ = 638809104. Its totient is φ = 638809102.

The previous prime is 638809063. The next prime is 638809109. The reversal of 638809103 is 301908836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638809103 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638809109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319404551 + 319404552.

It is an arithmetic number, because the mean of its divisors is an integer number (319404552).

Almost surely, 2^638809103 is an apocalyptic number.

638809103 is a deficient number, since it is larger than the sum of its proper divisors (1).

638809103 is an equidigital number, since it uses as much as digits as its factorization.

638809103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 638809103 is about 25274.6731531785. The cubic root of 638809103 is about 861.2390212502.

The spelling of 638809103 in words is "six hundred thirty-eight million, eight hundred nine thousand, one hundred three".