43391065 has 4 divisors (see below), whose sum is σ = 52069284. Its totient is φ = 34712848.

The previous prime is 43391063. The next prime is 43391081. The reversal of 43391065 is 56019334.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19263321 + 24127744 = 4389^2 + 4912^2 .

It is a cyclic number.

It is not a de Polignac number, because 43391065 - 2¹ = 43391063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43391063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4339102 + ... + 4339111.

It is an arithmetic number, because the mean of its divisors is an integer number (13017321).

Almost surely, 2^43391065 is an apocalyptic number.

It is an amenable number.

43391065 is a deficient number, since it is larger than the sum of its proper divisors (8678219).

43391065 is an equidigital number, since it uses as much as digits as its factorization.

43391065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8678218.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 43391065 is about 6587.1894613712. The cubic root of 43391065 is about 351.3986617589.

The spelling of 43391065 in words is "forty-three million, three hundred ninety-one thousand, sixty-five".