43220209 has 2 divisors, whose sum is σ = 43220210. Its totient is φ = 43220208.

The previous prime is 43220183. The next prime is 43220251. The reversal of 43220209 is 90202234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29322225 + 13897984 = 5415^2 + 3728^2 .

It is a cyclic number.

It is not a de Polignac number, because 43220209 - 2⁹ = 43219697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43220209.

It is not a weakly prime, because it can be changed into another prime (43220279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610104 + 21610105.

It is an arithmetic number, because the mean of its divisors is an integer number (21610105).

Almost surely, 2^43220209 is an apocalyptic number.

It is an amenable number.

43220209 is a deficient number, since it is larger than the sum of its proper divisors (1).

43220209 is an equidigital number, since it uses as much as digits as its factorization.

43220209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 43220209 is about 6574.2078610278. The cubic root of 43220209 is about 350.9368343842.

The spelling of 43220209 in words is "forty-three million, two hundred twenty thousand, two hundred nine".