43049621 has 4 divisors (see below), whose sum is σ = 43861932. Its totient is φ = 42237312.

The previous prime is 43049609. The next prime is 43049639. The reversal of 43049621 is 12694034.

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 27447121 + 15602500 = 5239^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 43049621 - 2¹⁰ = 43048597 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43049641) 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, 406076 + ... + 406181.

It is an arithmetic number, because the mean of its divisors is an integer number (10965483).

Almost surely, 2^43049621 is an apocalyptic number.

It is an amenable number.

43049621 is a deficient number, since it is larger than the sum of its proper divisors (812311).

43049621 is an equidigital number, since it uses as much as digits as its factorization.

43049621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812310.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 43049621 is about 6561.2209991739. The cubic root of 43049621 is about 350.4745155643.

The spelling of 43049621 in words is "forty-three million, forty-nine thousand, six hundred twenty-one".