43628521 has 2 divisors, whose sum is σ = 43628522. Its totient is φ = 43628520.

The previous prime is 43628491. The next prime is 43628527. The reversal of 43628521 is 12582634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37650496 + 5978025 = 6136^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 43628521 - 2¹⁹ = 43104233 is a prime.

It is not a weakly prime, because it can be changed into another prime (43628527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21814260 + 21814261.

It is an arithmetic number, because the mean of its divisors is an integer number (21814261).

Almost surely, 2^43628521 is an apocalyptic number.

It is an amenable number.

43628521 is a deficient number, since it is larger than the sum of its proper divisors (1).

43628521 is an equidigital number, since it uses as much as digits as its factorization.

43628521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 43628521 is about 6605.1889450643. The cubic root of 43628521 is about 352.0385014059.

The spelling of 43628521 in words is "forty-three million, six hundred twenty-eight thousand, five hundred twenty-one".