243340931 has 2 divisors, whose sum is σ = 243340932. Its totient is φ = 243340930.

The previous prime is 243340921. The next prime is 243340963. The reversal of 243340931 is 139043342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243340931 is a prime.

It is a super-2 number, since 2×243340931² = 118429617399893522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 243340894 and 243340903.

It is not a weakly prime, because it can be changed into another prime (243340921) 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, 121670465 + 121670466.

It is an arithmetic number, because the mean of its divisors is an integer number (121670466).

Almost surely, 2^243340931 is an apocalyptic number.

243340931 is a deficient number, since it is larger than the sum of its proper divisors (1).

243340931 is an equidigital number, since it uses as much as digits as its factorization.

243340931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 243340931 is about 15599.3888021294. The cubic root of 243340931 is about 624.3168480108.

The spelling of 243340931 in words is "two hundred forty-three million, three hundred forty thousand, nine hundred thirty-one".