208123189 has 2 divisors, whose sum is σ = 208123190. Its totient is φ = 208123188.

The previous prime is 208123177. The next prime is 208123193. The reversal of 208123189 is 981321802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113060689 + 95062500 = 10633^2 + 9750^2 .

It is a cyclic number.

It is not a de Polignac number, because 208123189 - 2¹⁹ = 207598901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208123109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104061594 + 104061595.

It is an arithmetic number, because the mean of its divisors is an integer number (104061595).

Almost surely, 2^208123189 is an apocalyptic number.

It is an amenable number.

208123189 is a deficient number, since it is larger than the sum of its proper divisors (1).

208123189 is an equidigital number, since it uses as much as digits as its factorization.

208123189 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 34.

The square root of 208123189 is about 14426.4752798457. The cubic root of 208123189 is about 592.6161607663.

The spelling of 208123189 in words is "two hundred eight million, one hundred twenty-three thousand, one hundred eighty-nine".