243421303531 has 8 divisors (see below), whose sum is σ = 278409618144. Its totient is φ = 208486449600.

The previous prime is 243421303529. The next prime is 243421303547. The reversal of 243421303531 is 135303124342.

It is a happy number.

243421303531 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 243421303531 - 2¹ = 243421303529 is a prime.

It is a super-2 number, since 2×243421303531² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243421303493 and 243421303502.

It is not an unprimeable number, because it can be changed into a prime (243421303561) 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, 13355410 + ... + 13373623.

It is an arithmetic number, because the mean of its divisors is an integer number (34801202268).

Almost surely, 2^243421303531 is an apocalyptic number.

243421303531 is a deficient number, since it is larger than the sum of its proper divisors (34988314613).

243421303531 is a wasteful number, since it uses less digits than its factorization.

243421303531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26730341.

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

Adding to 243421303531 its reverse (135303124342), we get a palindrome (378724427873).

The spelling of 243421303531 in words is "two hundred forty-three billion, four hundred twenty-one million, three hundred three thousand, five hundred thirty-one".