43504121 has 2 divisors, whose sum is σ = 43504122. Its totient is φ = 43504120.

The previous prime is 43504117. The next prime is 43504151. The reversal of 43504121 is 12140534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 16516096 = 5195^2 + 4064^2 .

It is a cyclic number.

It is not a de Polignac number, because 43504121 - 2² = 43504117 is a prime.

It is a Chen prime.

It is equal to p_2633240 and since 43504121 and 2633240 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 43504093 and 43504102.

It is not a weakly prime, because it can be changed into another prime (43504151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21752060 + 21752061.

It is an arithmetic number, because the mean of its divisors is an integer number (21752061).

Almost surely, 2^43504121 is an apocalyptic number.

It is an amenable number.

43504121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43504121 is an equidigital number, since it uses as much as digits as its factorization.

43504121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 43504121 is about 6595.7653839414. The cubic root of 43504121 is about 351.7035883858.

Adding to 43504121 its reverse (12140534), we get a palindrome (55644655).

The spelling of 43504121 in words is "forty-three million, five hundred four thousand, one hundred twenty-one".