43508609 has 2 divisors, whose sum is σ = 43508610. Its totient is φ = 43508608.

The previous prime is 43508579. The next prime is 43508611. The reversal of 43508609 is 90680534.

43508609 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., 32433025 + 11075584 = 5695^2 + 3328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43508609 is a prime.

It is a super-2 number, since 2×43508609² = 3785998114229762, which contains 22 as substring.

Together with 43508611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43508669) 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, 21754304 + 21754305.

It is an arithmetic number, because the mean of its divisors is an integer number (21754305).

Almost surely, 2^43508609 is an apocalyptic number.

It is an amenable number.

43508609 is a deficient number, since it is larger than the sum of its proper divisors (1).

43508609 is an equidigital number, since it uses as much as digits as its factorization.

43508609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 43508609 is about 6596.1055934544. The cubic root of 43508609 is about 351.7156821935.

The spelling of 43508609 in words is "forty-three million, five hundred eight thousand, six hundred nine".