200639861 has 2 divisors, whose sum is σ = 200639862. Its totient is φ = 200639860.

The previous prime is 200639827. The next prime is 200639903. The reversal of 200639861 is 168936002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193376836 + 7263025 = 13906^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 200639861 - 2¹⁸ = 200377717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200638861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100319930 + 100319931.

It is an arithmetic number, because the mean of its divisors is an integer number (100319931).

Almost surely, 2^200639861 is an apocalyptic number.

It is an amenable number.

200639861 is a deficient number, since it is larger than the sum of its proper divisors (1).

200639861 is an equidigital number, since it uses as much as digits as its factorization.

200639861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 200639861 is about 14164.7400611518. The cubic root of 200639861 is about 585.4265387060.

The spelling of 200639861 in words is "two hundred million, six hundred thirty-nine thousand, eight hundred sixty-one".