208161089 has 2 divisors, whose sum is σ = 208161090. Its totient is φ = 208161088.

The previous prime is 208161067. The next prime is 208161091. The reversal of 208161089 is 980161802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196224064 + 11937025 = 14008^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 208161089 - 2²⁴ = 191383873 is a prime.

Together with 208161091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (208161049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104080544 + 104080545.

It is an arithmetic number, because the mean of its divisors is an integer number (104080545).

Almost surely, 2^208161089 is an apocalyptic number.

It is an amenable number.

208161089 is a deficient number, since it is larger than the sum of its proper divisors (1).

208161089 is an equidigital number, since it uses as much as digits as its factorization.

208161089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 208161089 is about 14427.7887772174. The cubic root of 208161089 is about 592.6521311122.

The spelling of 208161089 in words is "two hundred eight million, one hundred sixty-one thousand, eighty-nine".