43020781 has 2 divisors, whose sum is σ = 43020782. Its totient is φ = 43020780.

The previous prime is 43020743. The next prime is 43020821. The reversal of 43020781 is 18702034.

43020781 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., 24098281 + 18922500 = 4909^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 43020781 - 2¹¹ = 43018733 is a prime.

It is a super-2 number, since 2×43020781² = 3701575195699922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43020721) 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, 21510390 + 21510391.

It is an arithmetic number, because the mean of its divisors is an integer number (21510391).

Almost surely, 2^43020781 is an apocalyptic number.

It is an amenable number.

43020781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43020781 is an equidigital number, since it uses as much as digits as its factorization.

43020781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 43020781 is about 6559.0228693000. The cubic root of 43020781 is about 350.3962342480.

The spelling of 43020781 in words is "forty-three million, twenty thousand, seven hundred eighty-one".