243135131 has 4 divisors (see below), whose sum is σ = 243643200. Its totient is φ = 242627064.

The previous prime is 243135127. The next prime is 243135143. The reversal of 243135131 is 131531342.

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 243135131 - 2² = 243135127 is a prime.

It is a super-2 number, since 2×243135131² = 118229383852774322, 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 = 243135097 and 243135106.

It is not an unprimeable number, because it can be changed into a prime (243135121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253316 + ... + 254273.

It is an arithmetic number, because the mean of its divisors is an integer number (60910800).

Almost surely, 2^243135131 is an apocalyptic number.

243135131 is a deficient number, since it is larger than the sum of its proper divisors (508069).

243135131 is an equidigital number, since it uses as much as digits as its factorization.

243135131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508068.

The product of its digits is 1080, while the sum is 23.

The square root of 243135131 is about 15592.7909945590. The cubic root of 243135131 is about 624.1407978292.

Adding to 243135131 its reverse (131531342), we get a palindrome (374666473).

The spelling of 243135131 in words is "two hundred forty-three million, one hundred thirty-five thousand, one hundred thirty-one".