43241981 has 2 divisors, whose sum is σ = 43241982. Its totient is φ = 43241980.

The previous prime is 43241977. The next prime is 43242013. The reversal of 43241981 is 18914234.

It is a happy number.

It is an a-pointer prime, because the next prime (43242013) can be obtained adding 43241981 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 12716356 = 5525^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 43241981 - 2² = 43241977 is a prime.

It is a super-2 number, since 2×43241981² = 3739737841608722, 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 (43241941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21620990 + 21620991.

It is an arithmetic number, because the mean of its divisors is an integer number (21620991).

Almost surely, 2^43241981 is an apocalyptic number.

It is an amenable number.

43241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43241981 is an equidigital number, since it uses as much as digits as its factorization.

43241981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 43241981 is about 6575.8635174401. The cubic root of 43241981 is about 350.9957521476.

The spelling of 43241981 in words is "forty-three million, two hundred forty-one thousand, nine hundred eighty-one".