206242019 has 2 divisors, whose sum is σ = 206242020. Its totient is φ = 206242018.

The previous prime is 206241983. The next prime is 206242021. The reversal of 206242019 is 910242602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206242019 is a prime.

It is a super-2 number, since 2×206242019² = 85071540802392722, which contains 22 as substring.

Together with 206242021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206241019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103121009 + 103121010.

It is an arithmetic number, because the mean of its divisors is an integer number (103121010).

Almost surely, 2^206242019 is an apocalyptic number.

206242019 is a deficient number, since it is larger than the sum of its proper divisors (1).

206242019 is an equidigital number, since it uses as much as digits as its factorization.

206242019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 206242019 is about 14361.1287509026. The cubic root of 206242019 is about 590.8252542269.

The spelling of 206242019 in words is "two hundred six million, two hundred forty-two thousand, nineteen".