243212231533 has 2 divisors, whose sum is σ = 243212231534. Its totient is φ = 243212231532.

The previous prime is 243212231489. The next prime is 243212231599. The reversal of 243212231533 is 335132212342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203402804004 + 39809427529 = 451002^2 + 199523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243212231533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243212231495 and 243212231504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243212241533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121606115766 + 121606115767.

It is an arithmetic number, because the mean of its divisors is an integer number (121606115767).

Almost surely, 2^243212231533 is an apocalyptic number.

It is an amenable number.

243212231533 is a deficient number, since it is larger than the sum of its proper divisors (1).

243212231533 is an equidigital number, since it uses as much as digits as its factorization.

243212231533 is an evil number, because the sum of its binary digits is even.

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

Adding to 243212231533 its reverse (335132212342), we get a palindrome (578344443875).

The spelling of 243212231533 in words is "two hundred forty-three billion, two hundred twelve million, two hundred thirty-one thousand, five hundred thirty-three".