200287981 has 2 divisors, whose sum is σ = 200287982. Its totient is φ = 200287980.

The previous prime is 200287951. The next prime is 200288021. The reversal of 200287981 is 189782002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185885956 + 14402025 = 13634^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 200287981 - 2⁷ = 200287853 is a prime.

It is a super-2 number, since 2×200287981² = 80230550666112722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 200287981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200287951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100143990 + 100143991.

It is an arithmetic number, because the mean of its divisors is an integer number (100143991).

Almost surely, 2^200287981 is an apocalyptic number.

It is an amenable number.

200287981 is a deficient number, since it is larger than the sum of its proper divisors (1).

200287981 is an equidigital number, since it uses as much as digits as its factorization.

200287981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 200287981 is about 14152.3136271071. The cubic root of 200287981 is about 585.0841002134.

The spelling of 200287981 in words is "two hundred million, two hundred eighty-seven thousand, nine hundred eighty-one".