208161081 has 12 divisors (see below), whose sum is σ = 301823808. Its totient is φ = 138244824.

The previous prime is 208161067. The next prime is 208161089. The reversal of 208161081 is 180161802.

It is not a de Polignac number, because 208161081 - 2⁵ = 208161049 is a prime.

It is a super-2 number, since 2×208161081² = 86662071286177122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208161089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41605 + ... + 46338.

It is an arithmetic number, because the mean of its divisors is an integer number (25151984).

Almost surely, 2^208161081 is an apocalyptic number.

It is an amenable number.

208161081 is a deficient number, since it is larger than the sum of its proper divisors (93662727).

208161081 is a wasteful number, since it uses less digits than its factorization.

208161081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88212 (or 88209 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 208161081 is about 14427.7884999746. The cubic root of 208161081 is about 592.6521235199.

The spelling of 208161081 in words is "two hundred eight million, one hundred sixty-one thousand, eighty-one".