638052029 has 2 divisors, whose sum is σ = 638052030. Its totient is φ = 638052028.

The previous prime is 638052011. The next prime is 638052031. The reversal of 638052029 is 920250836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629508100 + 8543929 = 25090^2 + 2923^2 .

It is a cyclic number.

It is not a de Polignac number, because 638052029 - 2²⁰ = 637003453 is a prime.

It is a super-2 number, since 2×638052029² = 814220783422033682, which contains 22 as substring.

Together with 638052031, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638052029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638052059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319026014 + 319026015.

It is an arithmetic number, because the mean of its divisors is an integer number (319026015).

Almost surely, 2^638052029 is an apocalyptic number.

It is an amenable number.

638052029 is a deficient number, since it is larger than the sum of its proper divisors (1).

638052029 is an equidigital number, since it uses as much as digits as its factorization.

638052029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 638052029 is about 25259.6917835511. The cubic root of 638052029 is about 860.8986590486.

The spelling of 638052029 in words is "six hundred thirty-eight million, fifty-two thousand, twenty-nine".