638264041 has 2 divisors, whose sum is σ = 638264042. Its totient is φ = 638264040.

The previous prime is 638263993. The next prime is 638264051. The reversal of 638264041 is 140462836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595164816 + 43099225 = 24396^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 638264041 - 2¹¹ = 638261993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638263988 and 638264006.

It is not a weakly prime, because it can be changed into another prime (638264051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319132020 + 319132021.

It is an arithmetic number, because the mean of its divisors is an integer number (319132021).

Almost surely, 2^638264041 is an apocalyptic number.

It is an amenable number.

638264041 is a deficient number, since it is larger than the sum of its proper divisors (1).

638264041 is an equidigital number, since it uses as much as digits as its factorization.

638264041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 638264041 is about 25263.8880816077. Note that the first 3 decimals coincide. The cubic root of 638264041 is about 860.9940016570.

The spelling of 638264041 in words is "six hundred thirty-eight million, two hundred sixty-four thousand, forty-one".