43991461 has 8 divisors (see below), whose sum is σ = 46765080. Its totient is φ = 41238528.

The previous prime is 43991447. The next prime is 43991473. The reversal of 43991461 is 16419934.

43991461 = T₅₄₁₄ + T₅₄₁₅ + T₅₄₁₆.

43991461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20079361 + 23912100 = 4481^2 + 4890^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43991461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43991461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43991491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666 + ... + 9403.

It is an arithmetic number, because the mean of its divisors is an integer number (5845635).

Almost surely, 2^43991461 is an apocalyptic number.

43991461 is the 5416-th centered triangular number.

It is an amenable number.

43991461 is a deficient number, since it is larger than the sum of its proper divisors (2773619).

43991461 is a wasteful number, since it uses less digits than its factorization.

43991461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343.

The product of its digits is 23328, while the sum is 37.

The square root of 43991461 is about 6632.6058981369. The cubic root of 43991461 is about 353.0119944457.

The spelling of 43991461 in words is "forty-three million, nine hundred ninety-one thousand, four hundred sixty-one".