206351231 has 2 divisors, whose sum is σ = 206351232. Its totient is φ = 206351230.

The previous prime is 206351209. The next prime is 206351263. The reversal of 206351231 is 132153602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206351231 - 2¹⁸ = 206089087 is a prime.

It is a super-2 number, since 2×206351231² = 85161661070430722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206351197 and 206351206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206051231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103175615 + 103175616.

It is an arithmetic number, because the mean of its divisors is an integer number (103175616).

Almost surely, 2^206351231 is an apocalyptic number.

206351231 is a deficient number, since it is larger than the sum of its proper divisors (1).

206351231 is an equidigital number, since it uses as much as digits as its factorization.

206351231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 206351231 is about 14364.9305950290. The cubic root of 206351231 is about 590.9295230238.

The spelling of 206351231 in words is "two hundred six million, three hundred fifty-one thousand, two hundred thirty-one".