43645969 has 2 divisors, whose sum is σ = 43645970. Its totient is φ = 43645968.

The previous prime is 43645949. The next prime is 43645981. The reversal of 43645969 is 96954634.

43645969 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., 21902400 + 21743569 = 4680^2 + 4663^2 .

It is a cyclic number.

It is not a de Polignac number, because 43645969 - 2⁵ = 43645937 is a prime.

It is a super-2 number, since 2×43645969² = 3809941219897922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43645949) 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, 21822984 + 21822985.

It is an arithmetic number, because the mean of its divisors is an integer number (21822985).

Almost surely, 2^43645969 is an apocalyptic number.

It is an amenable number.

43645969 is a deficient number, since it is larger than the sum of its proper divisors (1).

43645969 is an equidigital number, since it uses as much as digits as its factorization.

43645969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 46.

The square root of 43645969 is about 6606.5095928183. The cubic root of 43645969 is about 352.0854244506.

The spelling of 43645969 in words is "forty-three million, six hundred forty-five thousand, nine hundred sixty-nine".