243042531531 has 16 divisors (see below), whose sum is σ = 328547734944. Its totient is φ = 159783542784.

The previous prime is 243042531527. The next prime is 243042531569. The reversal of 243042531531 is 135135240342.

It is not a de Polignac number, because 243042531531 - 2² = 243042531527 is a prime.

It is a super-2 number, since 2×243042531531² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243042531492 and 243042531501.

It is not an unprimeable number, because it can be changed into a prime (243042531031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1355995 + ... + 1524731.

It is an arithmetic number, because the mean of its divisors is an integer number (20534233434).

Almost surely, 2^243042531531 is an apocalyptic number.

243042531531 is a deficient number, since it is larger than the sum of its proper divisors (85505203413).

243042531531 is a wasteful number, since it uses less digits than its factorization.

243042531531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175390.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 243042531531 its reverse (135135240342), we get a palindrome (378177771873).

The spelling of 243042531531 in words is "two hundred forty-three billion, forty-two million, five hundred thirty-one thousand, five hundred thirty-one".