200000081 has 2 divisors, whose sum is σ = 200000082. Its totient is φ = 200000080.

The previous prime is 200000069. The next prime is 200000083. The reversal of 200000081 is 180000002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199374400 + 625681 = 14120^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 200000081 - 2¹⁰ = 199999057 is a prime.

It is a super-2 number, since 2×200000081² = 80000064800013122, which contains 22 as substring.

Together with 200000083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (200000083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100000040 + 100000041.

It is an arithmetic number, because the mean of its divisors is an integer number (100000041).

Almost surely, 2^200000081 is an apocalyptic number.

It is an amenable number.

200000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

200000081 is an equidigital number, since it uses as much as digits as its factorization.

200000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 200000081 is about 14142.1384875131. The cubic root of 200000081 is about 584.8036265910.

Adding to 200000081 its reverse (180000002), we get a palindrome (380000083).

The spelling of 200000081 in words is "two hundred million, eighty-one", and thus it is an aban number.