243534131 has 2 divisors, whose sum is σ = 243534132. Its totient is φ = 243534130.

The previous prime is 243534121. The next prime is 243534139. The reversal of 243534131 is 131435342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243534131 is a prime.

It is a super-3 number, since 3×243534131³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243534131.

It is not a weakly prime, because it can be changed into another prime (243534139) 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, 121767065 + 121767066.

It is an arithmetic number, because the mean of its divisors is an integer number (121767066).

Almost surely, 2^243534131 is an apocalyptic number.

243534131 is a deficient number, since it is larger than the sum of its proper divisors (1).

243534131 is an equidigital number, since it uses as much as digits as its factorization.

243534131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 26.

The square root of 243534131 is about 15605.5801237891. The cubic root of 243534131 is about 624.4820293021.

Adding to 243534131 its reverse (131435342), we get a palindrome (374969473).

The spelling of 243534131 in words is "two hundred forty-three million, five hundred thirty-four thousand, one hundred thirty-one".