206887489 has 2 divisors, whose sum is σ = 206887490. Its totient is φ = 206887488.

The previous prime is 206887487. The next prime is 206887511. The reversal of 206887489 is 984788602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144793089 + 62094400 = 12033^2 + 7880^2 .

It is a cyclic number.

It is not a de Polignac number, because 206887489 - 2¹ = 206887487 is a prime.

Together with 206887487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (206887481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103443744 + 103443745.

It is an arithmetic number, because the mean of its divisors is an integer number (103443745).

Almost surely, 2^206887489 is an apocalyptic number.

It is an amenable number.

206887489 is a deficient number, since it is larger than the sum of its proper divisors (1).

206887489 is an equidigital number, since it uses as much as digits as its factorization.

206887489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The square root of 206887489 is about 14383.5840109480. The cubic root of 206887489 is about 591.4409755447.

The spelling of 206887489 in words is "two hundred six million, eight hundred eighty-seven thousand, four hundred eighty-nine".