243323131 has 2 divisors, whose sum is σ = 243323132. Its totient is φ = 243323130.

The previous prime is 243323077. The next prime is 243323147. The reversal of 243323131 is 131323342.

243323131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243323131 - 2¹⁵ = 243290363 is a prime.

It is a super-2 number, since 2×243323131² = 118412292159286322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243320131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121661565 + 121661566.

It is an arithmetic number, because the mean of its divisors is an integer number (121661566).

Almost surely, 2^243323131 is an apocalyptic number.

243323131 is a deficient number, since it is larger than the sum of its proper divisors (1).

243323131 is an equidigital number, since it uses as much as digits as its factorization.

243323131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 22.

The square root of 243323131 is about 15598.8182565219. The cubic root of 243323131 is about 624.3016250465.

Adding to 243323131 its reverse (131323342), we get a palindrome (374646473).

The spelling of 243323131 in words is "two hundred forty-three million, three hundred twenty-three thousand, one hundred thirty-one".