206681129 has 2 divisors, whose sum is σ = 206681130. Its totient is φ = 206681128.

The previous prime is 206681119. The next prime is 206681141. The reversal of 206681129 is 921186602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189475225 + 17205904 = 13765^2 + 4148^2 .

It is a cyclic number.

It is not a de Polignac number, because 206681129 - 2¹⁶ = 206615593 is a prime.

It is not a weakly prime, because it can be changed into another prime (206681119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103340564 + 103340565.

It is an arithmetic number, because the mean of its divisors is an integer number (103340565).

Almost surely, 2^206681129 is an apocalyptic number.

It is an amenable number.

206681129 is a deficient number, since it is larger than the sum of its proper divisors (1).

206681129 is an equidigital number, since it uses as much as digits as its factorization.

206681129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 206681129 is about 14376.4087657523. The cubic root of 206681129 is about 591.2442657898.

The spelling of 206681129 in words is "two hundred six million, six hundred eighty-one thousand, one hundred twenty-nine".