43630121 has 2 divisors, whose sum is σ = 43630122. Its totient is φ = 43630120.

The previous prime is 43630063. The next prime is 43630133. The reversal of 43630121 is 12103634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43626025 + 4096 = 6605^2 + 64^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43630121 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 43630093 and 43630102.

It is not a weakly prime, because it can be changed into another prime (43630151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21815060 + 21815061.

It is an arithmetic number, because the mean of its divisors is an integer number (21815061).

Almost surely, 2^43630121 is an apocalyptic number.

It is an amenable number.

43630121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43630121 is an equidigital number, since it uses as much as digits as its factorization.

43630121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 43630121 is about 6605.3100608526. The cubic root of 43630121 is about 352.0428048195.

Adding to 43630121 its reverse (12103634), we get a palindrome (55733755).

The spelling of 43630121 in words is "forty-three million, six hundred thirty thousand, one hundred twenty-one".