638053211 has 2 divisors, whose sum is σ = 638053212. Its totient is φ = 638053210.

The previous prime is 638053187. The next prime is 638053243. The reversal of 638053211 is 112350836.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638053211 is a prime.

It is a super-2 number, since 2×638053211² = 814223800134821042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638053291) 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, 319026605 + 319026606.

It is an arithmetic number, because the mean of its divisors is an integer number (319026606).

Almost surely, 2^638053211 is an apocalyptic number.

638053211 is a deficient number, since it is larger than the sum of its proper divisors (1).

638053211 is an equidigital number, since it uses as much as digits as its factorization.

638053211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 638053211 is about 25259.7151805004. The cubic root of 638053211 is about 860.8991906571.

The spelling of 638053211 in words is "six hundred thirty-eight million, fifty-three thousand, two hundred eleven".