42644171 has 4 divisors (see below), whose sum is σ = 43448832. Its totient is φ = 41839512.

The previous prime is 42644167. The next prime is 42644201. The reversal of 42644171 is 17144624.

It is a happy number.

42644171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42644171 - 2² = 42644167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42644111) 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 3 ways as a sum of consecutive naturals, for example, 402251 + ... + 402356.

It is an arithmetic number, because the mean of its divisors is an integer number (10862208).

Almost surely, 2^42644171 is an apocalyptic number.

42644171 is a deficient number, since it is larger than the sum of its proper divisors (804661).

42644171 is an equidigital number, since it uses as much as digits as its factorization.

42644171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804660.

The product of its digits is 5376, while the sum is 29.

The square root of 42644171 is about 6530.2504546150. The cubic root of 42644171 is about 349.3707633017.

Adding to 42644171 its reverse (17144624), we get a palindrome (59788795).

The spelling of 42644171 in words is "forty-two million, six hundred forty-four thousand, one hundred seventy-one".