638107273 has 2 divisors, whose sum is σ = 638107274. Its totient is φ = 638107272.

The previous prime is 638107259. The next prime is 638107277. The reversal of 638107273 is 372701836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362978704 + 275128569 = 19052^2 + 16587^2 .

It is a cyclic number.

It is not a de Polignac number, because 638107273 - 2⁵ = 638107241 is a prime.

It is not a weakly prime, because it can be changed into another prime (638107277) 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, 319053636 + 319053637.

It is an arithmetic number, because the mean of its divisors is an integer number (319053637).

Almost surely, 2^638107273 is an apocalyptic number.

It is an amenable number.

638107273 is a deficient number, since it is larger than the sum of its proper divisors (1).

638107273 is an equidigital number, since it uses as much as digits as its factorization.

638107273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 638107273 is about 25260.7852807469. The cubic root of 638107273 is about 860.9235045214.

The spelling of 638107273 in words is "six hundred thirty-eight million, one hundred seven thousand, two hundred seventy-three".