43233031981 has 2 divisors, whose sum is σ = 43233031982. Its totient is φ = 43233031980.

The previous prime is 43233031967. The next prime is 43233032053. The reversal of 43233031981 is 18913033234.

It is a happy number.

43233031981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43218667881 + 14364100 = 207891^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 43233031981 - 2¹⁵ = 43232999213 is a prime.

It is a super-2 number, since 2×43233031981² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43233031981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43233031901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21616515990 + 21616515991.

It is an arithmetic number, because the mean of its divisors is an integer number (21616515991).

Almost surely, 2^43233031981 is an apocalyptic number.

It is an amenable number.

43233031981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43233031981 is an equidigital number, since it uses as much as digits as its factorization.

43233031981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 43233031981 in words is "forty-three billion, two hundred thirty-three million, thirty-one thousand, nine hundred eighty-one".