43215281 has 2 divisors, whose sum is σ = 43215282. Its totient is φ = 43215280.

The previous prime is 43215269. The next prime is 43215283. The reversal of 43215281 is 18251234.

43215281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36240400 + 6974881 = 6020^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 43215281 - 2¹⁰ = 43214257 is a prime.

It is a super-2 number, since 2×43215281² = 3735121023817922, which contains 22 as substring.

Together with 43215283, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2616803 and since 43215281 and 2616803 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43215281.

It is not a weakly prime, because it can be changed into another prime (43215283) 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, 21607640 + 21607641.

It is an arithmetic number, because the mean of its divisors is an integer number (21607641).

Almost surely, 2^43215281 is an apocalyptic number.

It is an amenable number.

43215281 is a deficient number, since it is larger than the sum of its proper divisors (1).

43215281 is an equidigital number, since it uses as much as digits as its factorization.

43215281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 43215281 is about 6573.8330523371. The cubic root of 43215281 is about 350.9234958519.

The spelling of 43215281 in words is "forty-three million, two hundred fifteen thousand, two hundred eighty-one".