208000001 has 4 divisors (see below), whose sum is σ = 226909104. Its totient is φ = 189090900.

The previous prime is 207999997. The next prime is 208000007. The reversal of 208000001 is 100000802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208000001 - 2² = 207999997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (11), and also a Moran number because the ratio is a prime number: 18909091 = 208000001 / (2 + 0 + 8 + 0 + 0 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208000007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9454535 + ... + 9454556.

It is an arithmetic number, because the mean of its divisors is an integer number (56727276).

Almost surely, 2^208000001 is an apocalyptic number.

It is an amenable number.

208000001 is a deficient number, since it is larger than the sum of its proper divisors (18909103).

208000001 is a wasteful number, since it uses less digits than its factorization.

208000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18909102.

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

The square root of 208000001 is about 14422.2051365247. The cubic root of 208000001 is about 592.4992146310.

Adding to 208000001 its reverse (100000802), we get a palindrome (308000803).

The spelling of 208000001 in words is "two hundred eight million, one", and thus it is an aban number.