208561867 has 8 divisors (see below), whose sum is σ = 212240880. Its totient is φ = 204891360.

The previous prime is 208561849. The next prime is 208561891. The reversal of 208561867 is 768165802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208561867 - 2¹⁹ = 208037579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208561807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66108 + ... + 69190.

It is an arithmetic number, because the mean of its divisors is an integer number (26530110).

Almost surely, 2^208561867 is an apocalyptic number.

208561867 is a deficient number, since it is larger than the sum of its proper divisors (3679013).

208561867 is a wasteful number, since it uses less digits than its factorization.

208561867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4253.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 208561867 is about 14441.6711983067. The cubic root of 208561867 is about 593.0322368339.

The spelling of 208561867 in words is "two hundred eight million, five hundred sixty-one thousand, eight hundred sixty-seven".