43506013 has 4 divisors (see below), whose sum is σ = 43533180. Its totient is φ = 43478848.

The previous prime is 43506007. The next prime is 43506049. The reversal of 43506013 is 31060534.

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 3790809 + 39715204 = 1947^2 + 6302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43506013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43506083) 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, 11020 + ... + 14437.

It is an arithmetic number, because the mean of its divisors is an integer number (10883295).

Almost surely, 2^43506013 is an apocalyptic number.

It is an amenable number.

43506013 is a deficient number, since it is larger than the sum of its proper divisors (27167).

43506013 is a wasteful number, since it uses less digits than its factorization.

43506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27166.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 43506013 is about 6595.9088077383. The cubic root of 43506013 is about 351.7086868571.

Adding to 43506013 its reverse (31060534), we get a palindrome (74566547).

The spelling of 43506013 in words is "forty-three million, five hundred six thousand, thirteen".