638011069 has 2 divisors, whose sum is σ = 638011070. Its totient is φ = 638011068.

The previous prime is 638011061. The next prime is 638011079. The reversal of 638011069 is 960110836.

638011069 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., 348568900 + 289442169 = 18670^2 + 17013^2 .

It is a cyclic number.

It is not a de Polignac number, because 638011069 - 2³ = 638011061 is a prime.

It is a super-2 number, since 2×638011069² = 814116248333045522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638011061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319005534 + 319005535.

It is an arithmetic number, because the mean of its divisors is an integer number (319005535).

Almost surely, 2^638011069 is an apocalyptic number.

It is an amenable number.

638011069 is a deficient number, since it is larger than the sum of its proper divisors (1).

638011069 is an equidigital number, since it uses as much as digits as its factorization.

638011069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 638011069 is about 25258.8809926331. The cubic root of 638011069 is about 860.8802367455.

The spelling of 638011069 in words is "six hundred thirty-eight million, eleven thousand, sixty-nine".