43026661 has 4 divisors (see below), whose sum is σ = 43074400. Its totient is φ = 42978924.

The previous prime is 43026649. The next prime is 43026673. The reversal of 43026661 is 16662034.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (43026649) and next prime (43026673).

It is a 3-Lehmer number, since φ(43026661) divides (43026661-1)³.

It is a cyclic number.

It is not a de Polignac number, because 43026661 - 2¹¹ = 43024613 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 (43026601) 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, 22491 + ... + 24328.

It is an arithmetic number, because the mean of its divisors is an integer number (10768600).

Almost surely, 2^43026661 is an apocalyptic number.

It is an amenable number.

43026661 is a deficient number, since it is larger than the sum of its proper divisors (47739).

43026661 is an equidigital number, since it uses as much as digits as its factorization.

43026661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47738.

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

The square root of 43026661 is about 6559.4710914829. The cubic root of 43026661 is about 350.4121973550.

Adding to 43026661 its reverse (16662034), we get a palindrome (59688695).

The spelling of 43026661 in words is "forty-three million, twenty-six thousand, six hundred sixty-one".