206434381 has 2 divisors, whose sum is σ = 206434382. Its totient is φ = 206434380.

The previous prime is 206434379. The next prime is 206434391. The reversal of 206434381 is 183434602.

206434381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160655625 + 45778756 = 12675^2 + 6766^2 .

It is a cyclic number.

It is not a de Polignac number, because 206434381 - 2¹ = 206434379 is a prime.

It is a super-2 number, since 2×206434381² = 85230307317706322, which contains 22 as substring.

Together with 206434379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206434391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103217190 + 103217191.

It is an arithmetic number, because the mean of its divisors is an integer number (103217191).

Almost surely, 2^206434381 is an apocalyptic number.

It is an amenable number.

206434381 is a deficient number, since it is larger than the sum of its proper divisors (1).

206434381 is an equidigital number, since it uses as much as digits as its factorization.

206434381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 206434381 is about 14367.8245047745. The cubic root of 206434381 is about 591.0088847853.

Adding to 206434381 its reverse (183434602), we get a palindrome (389868983).

The spelling of 206434381 in words is "two hundred six million, four hundred thirty-four thousand, three hundred eighty-one".