638010949 has 2 divisors, whose sum is σ = 638010950. Its totient is φ = 638010948.

The previous prime is 638010931. The next prime is 638011061. The reversal of 638010949 is 949010836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438693025 + 199317924 = 20945^2 + 14118^2 .

It is a cyclic number.

It is not a de Polignac number, because 638010949 - 2¹¹ = 638008901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638010929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319005474 + 319005475.

It is an arithmetic number, because the mean of its divisors is an integer number (319005475).

Almost surely, 2^638010949 is an apocalyptic number.

It is an amenable number.

638010949 is a deficient number, since it is larger than the sum of its proper divisors (1).

638010949 is an equidigital number, since it uses as much as digits as its factorization.

638010949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 638010949 is about 25258.8786172308. The cubic root of 638010949 is about 860.8801827727.

The spelling of 638010949 in words is "six hundred thirty-eight million, ten thousand, nine hundred forty-nine".