43601609 has 2 divisors, whose sum is σ = 43601610. Its totient is φ = 43601608.

The previous prime is 43601581. The next prime is 43601611. The reversal of 43601609 is 90610634.

43601609 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., 43494025 + 107584 = 6595^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 43601609 - 2¹² = 43597513 is a prime.

It is a super-2 number, since 2×43601609² = 3802200614777762, which contains 22 as substring.

Together with 43601611, 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 (43801609) 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, 21800804 + 21800805.

It is an arithmetic number, because the mean of its divisors is an integer number (21800805).

Almost surely, 2^43601609 is an apocalyptic number.

It is an amenable number.

43601609 is a deficient number, since it is larger than the sum of its proper divisors (1).

43601609 is an equidigital number, since it uses as much as digits as its factorization.

43601609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 43601609 is about 6603.1514445755. The cubic root of 43601609 is about 351.9661022152.

The spelling of 43601609 in words is "forty-three million, six hundred one thousand, six hundred nine".