206442133 has 2 divisors, whose sum is σ = 206442134. Its totient is φ = 206442132.

The previous prime is 206442127. The next prime is 206442157. The reversal of 206442133 is 331244602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136585969 + 69856164 = 11687^2 + 8358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206442133 is a prime.

It is equal to p_11415751 and since 206442133 and 11415751 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 206442098 and 206442107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206442433) 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, 103221066 + 103221067.

It is an arithmetic number, because the mean of its divisors is an integer number (103221067).

Almost surely, 2^206442133 is an apocalyptic number.

It is an amenable number.

206442133 is a deficient number, since it is larger than the sum of its proper divisors (1).

206442133 is an equidigital number, since it uses as much as digits as its factorization.

206442133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 206442133 is about 14368.0942716840. The cubic root of 206442133 is about 591.0162825251.

Adding to 206442133 its reverse (331244602), we get a palindrome (537686735).

The spelling of 206442133 in words is "two hundred six million, four hundred forty-two thousand, one hundred thirty-three".