243133215131 has 4 divisors (see below), whose sum is σ = 248787475992. Its totient is φ = 237478954272.

The previous prime is 243133215121. The next prime is 243133215191. The reversal of 243133215131 is 131512331342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243133215131 is a prime.

It is a super-2 number, since 2×243133215131² (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 = 243133215094 and 243133215103.

It is not an unprimeable number, because it can be changed into a prime (243133215121) 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 in 3 ways as a sum of consecutive naturals, for example, 2827130366 + ... + 2827130451.

It is an arithmetic number, because the mean of its divisors is an integer number (62196868998).

Almost surely, 2^243133215131 is an apocalyptic number.

243133215131 is a deficient number, since it is larger than the sum of its proper divisors (5654260861).

243133215131 is an equidigital number, since it uses as much as digits as its factorization.

243133215131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5654260860.

The product of its digits is 6480, while the sum is 29.

Adding to 243133215131 its reverse (131512331342), we get a palindrome (374645546473).

The spelling of 243133215131 in words is "two hundred forty-three billion, one hundred thirty-three million, two hundred fifteen thousand, one hundred thirty-one".