206740231 has 2 divisors, whose sum is σ = 206740232. Its totient is φ = 206740230.

The previous prime is 206740223. The next prime is 206740243. The reversal of 206740231 is 132047602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206740231 - 2³ = 206740223 is a prime.

It is a super-2 number, since 2×206740231² = 85483046227866722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206740196 and 206740205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206740211) 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, 103370115 + 103370116.

It is an arithmetic number, because the mean of its divisors is an integer number (103370116).

Almost surely, 2^206740231 is an apocalyptic number.

206740231 is a deficient number, since it is larger than the sum of its proper divisors (1).

206740231 is an equidigital number, since it uses as much as digits as its factorization.

206740231 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 25.

The square root of 206740231 is about 14378.4641391214. The cubic root of 206740231 is about 591.3006173114.

Adding to 206740231 its reverse (132047602), we get a palindrome (338787833).

The spelling of 206740231 in words is "two hundred six million, seven hundred forty thousand, two hundred thirty-one".