208189489 has 2 divisors, whose sum is σ = 208189490. Its totient is φ = 208189488.

The previous prime is 208189477. The next prime is 208189507. The reversal of 208189489 is 984981802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121550625 + 86638864 = 11025^2 + 9308^2 .

It is a cyclic number.

It is not a de Polignac number, because 208189489 - 2²⁵ = 174635057 is a prime.

It is a super-2 number, since 2×208189489² = 86685726660162242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (208189409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104094744 + 104094745.

It is an arithmetic number, because the mean of its divisors is an integer number (104094745).

Almost surely, 2^208189489 is an apocalyptic number.

It is an amenable number.

208189489 is a deficient number, since it is larger than the sum of its proper divisors (1).

208189489 is an equidigital number, since it uses as much as digits as its factorization.

208189489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 208189489 is about 14428.7729554526. The cubic root of 208189489 is about 592.6790822829.

The spelling of 208189489 in words is "two hundred eight million, one hundred eighty-nine thousand, four hundred eighty-nine".