43123661 has 8 divisors (see below), whose sum is σ = 49599360. Its totient is φ = 36726768.

The previous prime is 43123657. The next prime is 43123669. The reversal of 43123661 is 16632134.

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

It is a cyclic number.

It is not a de Polignac number, because 43123661 - 2² = 43123657 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 43123661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43123669) 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 7 ways as a sum of consecutive naturals, for example, 18521 + ... + 20718.

It is an arithmetic number, because the mean of its divisors is an integer number (6199920).

Almost surely, 2^43123661 is an apocalyptic number.

It is an amenable number.

43123661 is a deficient number, since it is larger than the sum of its proper divisors (6475699).

43123661 is a wasteful number, since it uses less digits than its factorization.

43123661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39403.

The product of its digits is 2592, while the sum is 26.

The square root of 43123661 is about 6566.8608177728. The cubic root of 43123661 is about 350.6753246949.

Adding to 43123661 its reverse (16632134), we get a palindrome (59755795).

The spelling of 43123661 in words is "forty-three million, one hundred twenty-three thousand, six hundred sixty-one".