638201 has 2 divisors, whose sum is σ = 638202. Its totient is φ = 638200.

The previous prime is 638179. The next prime is 638233. The reversal of 638201 is 102836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 90601 = 740^2 + 301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638201 is a prime.

It is not a weakly prime, because it can be changed into another prime (638501) 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, 319100 + 319101.

It is an arithmetic number, because the mean of its divisors is an integer number (319101).

2⁶³⁸²⁰¹ is an apocalyptic number.

It is an amenable number.

638201 is a deficient number, since it is larger than the sum of its proper divisors (1).

638201 is an equidigital number, since it uses as much as digits as its factorization.

638201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 638201 is about 798.8748337506. The cubic root of 638201 is about 86.0965654084.

The spelling of 638201 in words is "six hundred thirty-eight thousand, two hundred one".