43121745 has 12 divisors (see below), whose sum is σ = 74744436. Its totient is φ = 22998240.

The previous prime is 43121731. The next prime is 43121747. The reversal of 43121745 is 54712134.

43121745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11716929 + 31404816 = 3423^2 + 5604^2 .

It is not a de Polignac number, because 43121745 - 2⁹ = 43121233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43121747) 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 11 ways as a sum of consecutive naturals, for example, 479086 + ... + 479175.

It is an arithmetic number, because the mean of its divisors is an integer number (6228703).

Almost surely, 2^43121745 is an apocalyptic number.

43121745 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43121745 is a deficient number, since it is larger than the sum of its proper divisors (31622691).

43121745 is a wasteful number, since it uses less digits than its factorization.

43121745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958272 (or 958269 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 43121745 is about 6566.7149321407. The cubic root of 43121745 is about 350.6701310738.

Adding to 43121745 its reverse (54712134), we get a palindrome (97833879).

The spelling of 43121745 in words is "forty-three million, one hundred twenty-one thousand, seven hundred forty-five".