243342131 has 4 divisors (see below), whose sum is σ = 257656392. Its totient is φ = 229027872.

The previous prime is 243342091. The next prime is 243342149. The reversal of 243342131 is 131243342.

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 243342131 - 2¹⁰ = 243341107 is a prime.

It is a super-2 number, since 2×243342131² = 118430785439242322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243342097 and 243342106.

It is not an unprimeable number, because it can be changed into a prime (243342331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7157105 + ... + 7157138.

It is an arithmetic number, because the mean of its divisors is an integer number (64414098).

Almost surely, 2^243342131 is an apocalyptic number.

243342131 is a deficient number, since it is larger than the sum of its proper divisors (14314261).

243342131 is a wasteful number, since it uses less digits than its factorization.

243342131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14314260.

The product of its digits is 1728, while the sum is 23.

The square root of 243342131 is about 15599.4272651274. The cubic root of 243342131 is about 624.3178742513.

Adding to 243342131 its reverse (131243342), we get a palindrome (374585473).

The spelling of 243342131 in words is "two hundred forty-three million, three hundred forty-two thousand, one hundred thirty-one".