243043321531 has 8 divisors (see below), whose sum is σ = 248995442304. Its totient is φ = 237092354880.

The previous prime is 243043321519. The next prime is 243043321603. The reversal of 243043321531 is 135123340342.

It is a happy number.

243043321531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243043321531 - 2⁷ = 243043321403 is a prime.

It is a super-2 number, since 2×243043321531² (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 = 243043321493 and 243043321502.

It is not an unprimeable number, because it can be changed into a prime (243043325531) 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 7 ways as a sum of consecutive naturals, for example, 145705 + ... + 712261.

It is an arithmetic number, because the mean of its divisors is an integer number (31124430288).

Almost surely, 2^243043321531 is an apocalyptic number.

243043321531 is a deficient number, since it is larger than the sum of its proper divisors (5952120773).

243043321531 is a wasteful number, since it uses less digits than its factorization.

243043321531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577061.

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 243043321531 its reverse (135123340342), we get a palindrome (378166661873).

The spelling of 243043321531 in words is "two hundred forty-three billion, forty-three million, three hundred twenty-one thousand, five hundred thirty-one".