43031121 has 16 divisors (see below), whose sum is σ = 65939328. Its totient is φ = 24451200.

The previous prime is 43031083. The next prime is 43031141. The reversal of 43031121 is 12113034.

It is not a de Polignac number, because 43031121 - 2¹⁵ = 42998353 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43031121.

It is not an unprimeable number, because it can be changed into a prime (43031141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1860 + ... + 9461.

It is an arithmetic number, because the mean of its divisors is an integer number (4121208).

Almost surely, 2^43031121 is an apocalyptic number.

It is an amenable number.

43031121 is a deficient number, since it is larger than the sum of its proper divisors (22908207).

43031121 is a wasteful number, since it uses less digits than its factorization.

43031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11512.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 43031121 is about 6559.8110491080. The cubic root of 43031121 is about 350.4243044561.

Adding to 43031121 its reverse (12113034), we get a palindrome (55144155).

The spelling of 43031121 in words is "forty-three million, thirty-one thousand, one hundred twenty-one".