243210123131 has 2 divisors, whose sum is σ = 243210123132. Its totient is φ = 243210123130.

The previous prime is 243210123109. The next prime is 243210123173. The reversal of 243210123131 is 131321012342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243210123131 - 2³⁰ = 242136381307 is a prime.

It is a super-2 number, since 2×243210123131² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243210123097 and 243210123106.

It is not a weakly prime, because it can be changed into another prime (243210123731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121605061565 + 121605061566.

It is an arithmetic number, because the mean of its divisors is an integer number (121605061566).

Almost surely, 2^243210123131 is an apocalyptic number.

243210123131 is a deficient number, since it is larger than the sum of its proper divisors (1).

243210123131 is an equidigital number, since it uses as much as digits as its factorization.

243210123131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 243210123131 its reverse (131321012342), we get a palindrome (374531135473).

The spelling of 243210123131 in words is "two hundred forty-three billion, two hundred ten million, one hundred twenty-three thousand, one hundred thirty-one".