43361909 has 2 divisors, whose sum is σ = 43361910. Its totient is φ = 43361908.

The previous prime is 43361881. The next prime is 43361921. The reversal of 43361909 is 90916334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32239684 + 11122225 = 5678^2 + 3335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43361909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43361959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21680954 + 21680955.

It is an arithmetic number, because the mean of its divisors is an integer number (21680955).

Almost surely, 2^43361909 is an apocalyptic number.

It is an amenable number.

43361909 is a deficient number, since it is larger than the sum of its proper divisors (1).

43361909 is an equidigital number, since it uses as much as digits as its factorization.

43361909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 43361909 is about 6584.9760060307. The cubic root of 43361909 is about 351.3199383706.

The spelling of 43361909 in words is "forty-three million, three hundred sixty-one thousand, nine hundred nine".