638413541 has 2 divisors, whose sum is σ = 638413542. Its totient is φ = 638413540.

The previous prime is 638413513. The next prime is 638413609. The reversal of 638413541 is 145314836.

638413541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452200225 + 186213316 = 21265^2 + 13646^2 .

It is a cyclic number.

It is not a de Polignac number, because 638413541 - 2¹⁴ = 638397157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638413441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319206770 + 319206771.

It is an arithmetic number, because the mean of its divisors is an integer number (319206771).

Almost surely, 2^638413541 is an apocalyptic number.

It is an amenable number.

638413541 is a deficient number, since it is larger than the sum of its proper divisors (1).

638413541 is an equidigital number, since it uses as much as digits as its factorization.

638413541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 638413541 is about 25266.8466770193. The cubic root of 638413541 is about 861.0612196871.

The spelling of 638413541 in words is "six hundred thirty-eight million, four hundred thirteen thousand, five hundred forty-one".