200771981 has 2 divisors, whose sum is σ = 200771982. Its totient is φ = 200771980.

The previous prime is 200771951. The next prime is 200771983. The reversal of 200771981 is 189177002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128368900 + 72403081 = 11330^2 + 8509^2 .

It is a cyclic number.

It is not a de Polignac number, because 200771981 - 2¹⁰ = 200770957 is a prime.

It is a super-2 number, since 2×200771981² = 80618776709328722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 200771983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200771983) 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, 100385990 + 100385991.

It is an arithmetic number, because the mean of its divisors is an integer number (100385991).

Almost surely, 2^200771981 is an apocalyptic number.

It is an amenable number.

200771981 is a deficient number, since it is larger than the sum of its proper divisors (1).

200771981 is an equidigital number, since it uses as much as digits as its factorization.

200771981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 200771981 is about 14169.4029867175. The cubic root of 200771981 is about 585.5550103246. Note that the first 3 decimals are identical.

The spelling of 200771981 in words is "two hundred million, seven hundred seventy-one thousand, nine hundred eighty-one".