43218971 has 2 divisors, whose sum is σ = 43218972. Its totient is φ = 43218970.

The previous prime is 43218949. The next prime is 43218983. The reversal of 43218971 is 17981234.

43218971 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 is a cyclic number.

It is not a de Polignac number, because 43218971 - 2¹⁰ = 43217947 is a prime.

It is a Chen prime.

It is equal to p_2616992 and since 43218971 and 2616992 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43218271) 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, 21609485 + 21609486.

It is an arithmetic number, because the mean of its divisors is an integer number (21609486).

Almost surely, 2^43218971 is an apocalyptic number.

43218971 is a deficient number, since it is larger than the sum of its proper divisors (1).

43218971 is an equidigital number, since it uses as much as digits as its factorization.

43218971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 43218971 is about 6574.1137045232. The cubic root of 43218971 is about 350.9334836064.

The spelling of 43218971 in words is "forty-three million, two hundred eighteen thousand, nine hundred seventy-one".