43679561 has 4 divisors (see below), whose sum is σ = 43828932. Its totient is φ = 43530192.

The previous prime is 43679557. The next prime is 43679569. The reversal of 43679561 is 16597634.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16597634 = 2 ⋅8298817.

It can be written as a sum of positive squares in 2 ways, for example, as 42823936 + 855625 = 6544^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 43679561 - 2² = 43679557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43679569) 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, 74246 + ... + 74831.

It is an arithmetic number, because the mean of its divisors is an integer number (10957233).

Almost surely, 2^43679561 is an apocalyptic number.

It is an amenable number.

43679561 is a deficient number, since it is larger than the sum of its proper divisors (149371).

43679561 is a wasteful number, since it uses less digits than its factorization.

43679561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149370.

The product of its digits is 136080, while the sum is 41.

The square root of 43679561 is about 6609.0514447990. The cubic root of 43679561 is about 352.1757284800.

It can be divided in two parts, 436 and 79561, that added together give a palindrome (79997).

The spelling of 43679561 in words is "forty-three million, six hundred seventy-nine thousand, five hundred sixty-one".