208642161 has 24 divisors (see below), whose sum is σ = 344274240. Its totient is φ = 110051136.

The previous prime is 208642151. The next prime is 208642169. The reversal of 208642161 is 161246802.

208642161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 208642161 - 2⁹ = 208641649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208642169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25846 + ... + 32943.

It is an arithmetic number, because the mean of its divisors is an integer number (14344760).

Almost surely, 2^208642161 is an apocalyptic number.

208642161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

208642161 is a deficient number, since it is larger than the sum of its proper divisors (135632079).

208642161 is a wasteful number, since it uses less digits than its factorization.

208642161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58825 (or 58812 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 208642161 is about 14444.4508722208. The cubic root of 208642161 is about 593.1083306756.

Adding to 208642161 its reverse (161246802), we get a palindrome (369888963).

The spelling of 208642161 in words is "two hundred eight million, six hundred forty-two thousand, one hundred sixty-one".