43006981 has 2 divisors, whose sum is σ = 43006982. Its totient is φ = 43006980.

The previous prime is 43006979. The next prime is 43006993. The reversal of 43006981 is 18960034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 3744225 = 6266^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 43006981 - 2¹ = 43006979 is a prime.

It is a super-2 number, since 2×43006981² = 3699200829468722, which contains 22 as substring.

Together with 43006979, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43003981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21503490 + 21503491.

It is an arithmetic number, because the mean of its divisors is an integer number (21503491).

Almost surely, 2^43006981 is an apocalyptic number.

It is an amenable number.

43006981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43006981 is an equidigital number, since it uses as much as digits as its factorization.

43006981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 43006981 is about 6557.9707989591. The cubic root of 43006981 is about 350.3587640995.

The spelling of 43006981 in words is "forty-three million, six thousand, nine hundred eighty-one".