43331009 has 4 divisors (see below), whose sum is σ = 43555716. Its totient is φ = 43106304.

The previous prime is 43330999. The next prime is 43331021. The reversal of 43331009 is 90013334.

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 30030400 + 13300609 = 5480^2 + 3647^2 .

It is a cyclic number.

It is not a de Polignac number, because 43331009 - 2⁴ = 43330993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43331059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112064 + ... + 112449.

It is an arithmetic number, because the mean of its divisors is an integer number (10888929).

Almost surely, 2^43331009 is an apocalyptic number.

It is an amenable number.

43331009 is a deficient number, since it is larger than the sum of its proper divisors (224707).

43331009 is a wasteful number, since it uses less digits than its factorization.

43331009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224706.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 43331009 is about 6582.6293378862. The cubic root of 43331009 is about 351.2364675241.

The spelling of 43331009 in words is "forty-three million, three hundred thirty-one thousand, nine".