208630861 has 16 divisors (see below), whose sum is σ = 222539904. Its totient is φ = 195174144.

The previous prime is 208630859. The next prime is 208630867. The reversal of 208630861 is 168036802.

It is a cyclic number.

It is not a de Polignac number, because 208630861 - 2¹ = 208630859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208630867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229570 + ... + 230476.

It is an arithmetic number, because the mean of its divisors is an integer number (13908744).

Almost surely, 2^208630861 is an apocalyptic number.

It is an amenable number.

208630861 is a deficient number, since it is larger than the sum of its proper divisors (13909043).

208630861 is a wasteful number, since it uses less digits than its factorization.

208630861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 208630861 is about 14444.0597132524. The cubic root of 208630861 is about 593.0976229562.

The spelling of 208630861 in words is "two hundred eight million, six hundred thirty thousand, eight hundred sixty-one".