43661121 has 32 divisors (see below), whose sum is σ = 68428800. Its totient is φ = 24248640.

The previous prime is 43661119. The next prime is 43661141. The reversal of 43661121 is 12116634.

It is not a de Polignac number, because 43661121 - 2¹ = 43661119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43661091 and 43661100.

It is not an unprimeable number, because it can be changed into a prime (43661141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162175 + ... + 162443.

It is an arithmetic number, because the mean of its divisors is an integer number (2138400).

Almost surely, 2^43661121 is an apocalyptic number.

It is an amenable number.

43661121 is a deficient number, since it is larger than the sum of its proper divisors (24767679).

43661121 is a wasteful number, since it uses less digits than its factorization.

43661121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469.

The product of its digits is 864, while the sum is 24.

The square root of 43661121 is about 6607.6562410585. The cubic root of 43661121 is about 352.1261627002.

Adding to 43661121 its reverse (12116634), we get a palindrome (55777755).

The spelling of 43661121 in words is "forty-three million, six hundred sixty-one thousand, one hundred twenty-one".