638147051 has 2 divisors, whose sum is σ = 638147052. Its totient is φ = 638147050.

The previous prime is 638147039. The next prime is 638147057. The reversal of 638147051 is 150741836.

638147051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638147051 - 2¹⁴ = 638130667 is a prime.

It is not a weakly prime, because it can be changed into another prime (638147057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319073525 + 319073526.

It is an arithmetic number, because the mean of its divisors is an integer number (319073526).

Almost surely, 2^638147051 is an apocalyptic number.

638147051 is a deficient number, since it is larger than the sum of its proper divisors (1).

638147051 is an equidigital number, since it uses as much as digits as its factorization.

638147051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 638147051 is about 25261.5726153381. The cubic root of 638147051 is about 860.9413934172.

Adding to 638147051 its reverse (150741836), we get a palindrome (788888887).

The spelling of 638147051 in words is "six hundred thirty-eight million, one hundred forty-seven thousand, fifty-one".