43253521 has 2 divisors, whose sum is σ = 43253522. Its totient is φ = 43253520.

The previous prime is 43253479. The next prime is 43253531. The reversal of 43253521 is 12535234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28515600 + 14737921 = 5340^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 43253521 - 2⁷ = 43253393 is a prime.

It is not a weakly prime, because it can be changed into another prime (43253531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21626760 + 21626761.

It is an arithmetic number, because the mean of its divisors is an integer number (21626761).

Almost surely, 2^43253521 is an apocalyptic number.

It is an amenable number.

43253521 is a deficient number, since it is larger than the sum of its proper divisors (1).

43253521 is an equidigital number, since it uses as much as digits as its factorization.

43253521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 25.

The square root of 43253521 is about 6576.7409102077. The cubic root of 43253521 is about 351.0269728165.

Adding to 43253521 its reverse (12535234), we get a palindrome (55788755).

The spelling of 43253521 in words is "forty-three million, two hundred fifty-three thousand, five hundred twenty-one".