43631121 has 4 divisors (see below), whose sum is σ = 58174832. Its totient is φ = 29087412.

The previous prime is 43631117. The next prime is 43631171. The reversal of 43631121 is 12113634.

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 not a de Polignac number, because 43631121 - 2² = 43631117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43631171) 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, 7271851 + ... + 7271856.

It is an arithmetic number, because the mean of its divisors is an integer number (14543708).

Almost surely, 2^43631121 is an apocalyptic number.

It is an amenable number.

43631121 is a deficient number, since it is larger than the sum of its proper divisors (14543711).

43631121 is a wasteful number, since it uses less digits than its factorization.

43631121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14543710.

The product of its digits is 432, while the sum is 21.

The square root of 43631121 is about 6605.3857570925. The cubic root of 43631121 is about 352.0454943996.

Adding to 43631121 its reverse (12113634), we get a palindrome (55744755).

The spelling of 43631121 in words is "forty-three million, six hundred thirty-one thousand, one hundred twenty-one".