43564009 has 2 divisors, whose sum is σ = 43564010. Its totient is φ = 43564008.

The previous prime is 43563983. The next prime is 43564043. The reversal of 43564009 is 90046534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 595984 = 6555^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 43564009 - 2⁵ = 43563977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43564049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21782004 + 21782005.

It is an arithmetic number, because the mean of its divisors is an integer number (21782005).

Almost surely, 2^43564009 is an apocalyptic number.

It is an amenable number.

43564009 is a deficient number, since it is larger than the sum of its proper divisors (1).

43564009 is an equidigital number, since it uses as much as digits as its factorization.

43564009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 43564009 is about 6600.3037051336. The cubic root of 43564009 is about 351.8649000526.

The spelling of 43564009 in words is "forty-three million, five hundred sixty-four thousand, nine".