638030633 has 2 divisors, whose sum is σ = 638030634. Its totient is φ = 638030632.

The previous prime is 638030581. The next prime is 638030663. The reversal of 638030633 is 336030836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536987929 + 101042704 = 23173^2 + 10052^2 .

It is a cyclic number.

It is not a de Polignac number, because 638030633 - 2¹⁴ = 638014249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638030633.

It is not a weakly prime, because it can be changed into another prime (638030663) 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, 319015316 + 319015317.

It is an arithmetic number, because the mean of its divisors is an integer number (319015317).

Almost surely, 2^638030633 is an apocalyptic number.

It is an amenable number.

638030633 is a deficient number, since it is larger than the sum of its proper divisors (1).

638030633 is an equidigital number, since it uses as much as digits as its factorization.

638030633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 638030633 is about 25259.2682593934. The cubic root of 638030633 is about 860.8890360122.

The spelling of 638030633 in words is "six hundred thirty-eight million, thirty thousand, six hundred thirty-three".