638038361 has 2 divisors, whose sum is σ = 638038362. Its totient is φ = 638038360.

The previous prime is 638038337. The next prime is 638038369. The reversal of 638038361 is 163830836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621554761 + 16483600 = 24931^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 638038361 - 2¹⁴ = 638021977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (638038369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319019180 + 319019181.

It is an arithmetic number, because the mean of its divisors is an integer number (319019181).

Almost surely, 2^638038361 is an apocalyptic number.

It is an amenable number.

638038361 is a deficient number, since it is larger than the sum of its proper divisors (1).

638038361 is an equidigital number, since it uses as much as digits as its factorization.

638038361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 638038361 is about 25259.4212324827. The cubic root of 638038361 is about 860.8925117720.

The spelling of 638038361 in words is "six hundred thirty-eight million, thirty-eight thousand, three hundred sixty-one".