638144201 has 2 divisors, whose sum is σ = 638144202. Its totient is φ = 638144200.

The previous prime is 638144197. The next prime is 638144231. The reversal of 638144201 is 102441836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360088576 + 278055625 = 18976^2 + 16675^2 .

It is a cyclic number.

It is not a de Polignac number, because 638144201 - 2² = 638144197 is a prime.

It is not a weakly prime, because it can be changed into another prime (638144231) 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, 319072100 + 319072101.

It is an arithmetic number, because the mean of its divisors is an integer number (319072101).

Almost surely, 2^638144201 is an apocalyptic number.

It is an amenable number.

638144201 is a deficient number, since it is larger than the sum of its proper divisors (1).

638144201 is an equidigital number, since it uses as much as digits as its factorization.

638144201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 638144201 is about 25261.5162054854. The cubic root of 638144201 is about 860.9401117447.

The spelling of 638144201 in words is "six hundred thirty-eight million, one hundred forty-four thousand, two hundred one".