243121240331 has 2 divisors, whose sum is σ = 243121240332. Its totient is φ = 243121240330.

The previous prime is 243121240303. The next prime is 243121240333. The reversal of 243121240331 is 133042121342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121240331 is a prime.

It is a super-2 number, since 2×243121240331² (a number of 24 digits) contains 22 as substring.

Together with 243121240333, it forms a pair of twin primes.

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 243121240331.

It is not a weakly prime, because it can be changed into another prime (243121240333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560620165 + 121560620166.

It is an arithmetic number, because the mean of its divisors is an integer number (121560620166).

Almost surely, 2^243121240331 is an apocalyptic number.

243121240331 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121240331 is an equidigital number, since it uses as much as digits as its factorization.

243121240331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 243121240331 its reverse (133042121342), we get a palindrome (376163361673).

The spelling of 243121240331 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, three hundred thirty-one".