206441869 has 2 divisors, whose sum is σ = 206441870. Its totient is φ = 206441868.

The previous prime is 206441861. The next prime is 206441881. The reversal of 206441869 is 968144602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164994025 + 41447844 = 12845^2 + 6438^2 .

It is a cyclic number.

It is not a de Polignac number, because 206441869 - 2³ = 206441861 is a prime.

It is a super-2 number, since 2×206441869² = 85236490552426322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206441861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103220934 + 103220935.

It is an arithmetic number, because the mean of its divisors is an integer number (103220935).

Almost surely, 2^206441869 is an apocalyptic number.

It is an amenable number.

206441869 is a deficient number, since it is larger than the sum of its proper divisors (1).

206441869 is an equidigital number, since it uses as much as digits as its factorization.

206441869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 206441869 is about 14368.0850846590. The cubic root of 206441869 is about 591.0160305927.

The spelling of 206441869 in words is "two hundred six million, four hundred forty-one thousand, eight hundred sixty-nine".