43661413 has 4 divisors (see below), whose sum is σ = 43683948. Its totient is φ = 43638880.

The previous prime is 43661381. The next prime is 43661417. The reversal of 43661413 is 31416634.

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 34316164 + 9345249 = 5858^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 43661413 - 2⁵ = 43661381 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 (43661417) 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, 8056 + ... + 12337.

It is an arithmetic number, because the mean of its divisors is an integer number (10920987).

Almost surely, 2^43661413 is an apocalyptic number.

It is an amenable number.

43661413 is a deficient number, since it is larger than the sum of its proper divisors (22535).

43661413 is a wasteful number, since it uses less digits than its factorization.

43661413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22534.

The product of its digits is 5184, while the sum is 28.

The square root of 43661413 is about 6607.6783366020. The cubic root of 43661413 is about 352.1269476900.

The spelling of 43661413 in words is "forty-three million, six hundred sixty-one thousand, four hundred thirteen".