206551129 has 2 divisors, whose sum is σ = 206551130. Its totient is φ = 206551128.

The previous prime is 206551127. The next prime is 206551133. The reversal of 206551129 is 921155602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191767104 + 14784025 = 13848^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 206551129 - 2¹ = 206551127 is a prime.

Together with 206551127, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 206551129.

It is not a weakly prime, because it can be changed into another prime (206551127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103275564 + 103275565.

It is an arithmetic number, because the mean of its divisors is an integer number (103275565).

Almost surely, 2^206551129 is an apocalyptic number.

It is an amenable number.

206551129 is a deficient number, since it is larger than the sum of its proper divisors (1).

206551129 is an equidigital number, since it uses as much as digits as its factorization.

206551129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 206551129 is about 14371.8867585297. The cubic root of 206551129 is about 591.1202778934.

The spelling of 206551129 in words is "two hundred six million, five hundred fifty-one thousand, one hundred twenty-nine".