638242141 has 2 divisors, whose sum is σ = 638242142. Its totient is φ = 638242140.

The previous prime is 638242133. The next prime is 638242147. The reversal of 638242141 is 141242836.

638242141 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 can be written as a sum of positive squares in only one way, i.e., 633528900 + 4713241 = 25170^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 638242141 - 2³ = 638242133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638242147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319121070 + 319121071.

It is an arithmetic number, because the mean of its divisors is an integer number (319121071).

Almost surely, 2^638242141 is an apocalyptic number.

It is an amenable number.

638242141 is a deficient number, since it is larger than the sum of its proper divisors (1).

638242141 is an equidigital number, since it uses as much as digits as its factorization.

638242141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 638242141 is about 25263.4546529171. The cubic root of 638242141 is about 860.9841541210.

Adding to 638242141 its reverse (141242836), we get a palindrome (779484977).

The spelling of 638242141 in words is "six hundred thirty-eight million, two hundred forty-two thousand, one hundred forty-one".