243354212131 has 4 divisors (see below), whose sum is σ = 243357560992. Its totient is φ = 243350863272.

The previous prime is 243354212119. The next prime is 243354212141. The reversal of 243354212131 is 131212453342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243354212131 - 2¹⁷ = 243354081059 is a prime.

It is a super-2 number, since 2×243354212131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243354212093 and 243354212102.

It is not an unprimeable number, because it can be changed into a prime (243354212141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1562955 + ... + 1711588.

It is an arithmetic number, because the mean of its divisors is an integer number (60839390248).

Almost surely, 2^243354212131 is an apocalyptic number.

243354212131 is a deficient number, since it is larger than the sum of its proper divisors (3348861).

243354212131 is an equidigital number, since it uses as much as digits as its factorization.

243354212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3348860.

The product of its digits is 17280, while the sum is 31.

Adding to 243354212131 its reverse (131212453342), we get a palindrome (374566665473).

The spelling of 243354212131 in words is "two hundred forty-three billion, three hundred fifty-four million, two hundred twelve thousand, one hundred thirty-one".