208887869 has 2 divisors, whose sum is σ = 208887870. Its totient is φ = 208887868.

The previous prime is 208887803. The next prime is 208887871. The reversal of 208887869 is 968788802.

208887869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206295769 + 2592100 = 14363^2 + 1610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208887869 is a prime.

It is a super-2 number, since 2×208887869² = 87268283630722322, which contains 22 as substring.

Together with 208887871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208883869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104443934 + 104443935.

It is an arithmetic number, because the mean of its divisors is an integer number (104443935).

Almost surely, 2^208887869 is an apocalyptic number.

It is an amenable number.

208887869 is a deficient number, since it is larger than the sum of its proper divisors (1).

208887869 is an equidigital number, since it uses as much as digits as its factorization.

208887869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3096576, while the sum is 56.

The square root of 208887869 is about 14452.9536427680. The cubic root of 208887869 is about 593.3410645446.

The spelling of 208887869 in words is "two hundred eight million, eight hundred eighty-seven thousand, eight hundred sixty-nine".