638302051 has 2 divisors, whose sum is σ = 638302052. Its totient is φ = 638302050.

The previous prime is 638301991. The next prime is 638302069. The reversal of 638302051 is 150203836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638302051 - 2⁹ = 638301539 is a prime.

It is not a weakly prime, because it can be changed into another prime (638302081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319151025 + 319151026.

It is an arithmetic number, because the mean of its divisors is an integer number (319151026).

Almost surely, 2^638302051 is an apocalyptic number.

638302051 is a deficient number, since it is larger than the sum of its proper divisors (1).

638302051 is an equidigital number, since it uses as much as digits as its factorization.

638302051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 638302051 is about 25264.6403299156. The cubic root of 638302051 is about 861.0110926675.

Adding to 638302051 its reverse (150203836), we get a palindrome (788505887).

The spelling of 638302051 in words is "six hundred thirty-eight million, three hundred two thousand, fifty-one".