206107381 has 2 divisors, whose sum is σ = 206107382. Its totient is φ = 206107380.

The previous prime is 206107351. The next prime is 206107403. The reversal of 206107381 is 183701602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133772356 + 72335025 = 11566^2 + 8505^2 .

It is a cyclic number.

It is not a de Polignac number, because 206107381 - 2¹⁵ = 206074613 is a prime.

It is a super-2 number, since 2×206107381² = 84960505005358322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206107331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103053690 + 103053691.

It is an arithmetic number, because the mean of its divisors is an integer number (103053691).

Almost surely, 2^206107381 is an apocalyptic number.

It is an amenable number.

206107381 is a deficient number, since it is larger than the sum of its proper divisors (1).

206107381 is an equidigital number, since it uses as much as digits as its factorization.

206107381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 206107381 is about 14356.4404014366. The cubic root of 206107381 is about 590.6966595994.

Adding to 206107381 its reverse (183701602), we get a palindrome (389808983).

The spelling of 206107381 in words is "two hundred six million, one hundred seven thousand, three hundred eighty-one".