200542817 has 2 divisors, whose sum is σ = 200542818. Its totient is φ = 200542816.

The previous prime is 200542789. The next prime is 200542871. The reversal of 200542817 is 718245002.

Together with next prime (200542871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200477281 + 65536 = 14159^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 200542817 - 2¹⁸ = 200280673 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200542817.

It is not a weakly prime, because it can be changed into another prime (200542877) 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, 100271408 + 100271409.

It is an arithmetic number, because the mean of its divisors is an integer number (100271409).

Almost surely, 2^200542817 is an apocalyptic number.

It is an amenable number.

200542817 is a deficient number, since it is larger than the sum of its proper divisors (1).

200542817 is an equidigital number, since it uses as much as digits as its factorization.

200542817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 200542817 is about 14161.3140986280. The cubic root of 200542817 is about 585.3321385626.

Adding to 200542817 its reverse (718245002), we get a palindrome (918787819).

The spelling of 200542817 in words is "two hundred million, five hundred forty-two thousand, eight hundred seventeen".