206181439 has 2 divisors, whose sum is σ = 206181440. Its totient is φ = 206181438.

The previous prime is 206181401. The next prime is 206181449. The reversal of 206181439 is 934181602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206181439 is a prime.

It is a super-2 number, since 2×206181439² = 85021571576221442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206181449) 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, 103090719 + 103090720.

It is an arithmetic number, because the mean of its divisors is an integer number (103090720).

Almost surely, 2^206181439 is an apocalyptic number.

206181439 is a deficient number, since it is larger than the sum of its proper divisors (1).

206181439 is an equidigital number, since it uses as much as digits as its factorization.

206181439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 206181439 is about 14359.0194303093. The cubic root of 206181439 is about 590.7674003536.

The spelling of 206181439 in words is "two hundred six million, one hundred eighty-one thousand, four hundred thirty-nine".