47243981 has 2 divisors, whose sum is σ = 47243982. Its totient is φ = 47243980.

The previous prime is 47243957. The next prime is 47244011. The reversal of 47243981 is 18934274.

47243981 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., 30360100 + 16883881 = 5510^2 + 4109^2 .

It is a cyclic number.

It is not a de Polignac number, because 47243981 - 2¹⁰ = 47242957 is a prime.

It is a super-2 number, since 2×47243981² = 4463987481456722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47243941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23621990 + 23621991.

It is an arithmetic number, because the mean of its divisors is an integer number (23621991).

Almost surely, 2^47243981 is an apocalyptic number.

It is an amenable number.

47243981 is a deficient number, since it is larger than the sum of its proper divisors (1).

47243981 is an equidigital number, since it uses as much as digits as its factorization.

47243981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 47243981 is about 6873.4257106628. The cubic root of 47243981 is about 361.5059880260.

The spelling of 47243981 in words is "forty-seven million, two hundred forty-three thousand, nine hundred eighty-one".