6444521 has 2 divisors, whose sum is σ = 6444522. Its totient is φ = 6444520.

The previous prime is 6444517. The next prime is 6444533. The reversal of 6444521 is 1254446.

6444521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6431296 + 13225 = 2536^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444521 - 2² = 6444517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6444541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222260 + 3222261.

It is an arithmetic number, because the mean of its divisors is an integer number (3222261).

Almost surely, 2^6444521 is an apocalyptic number.

It is an amenable number.

6444521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444521 is an equidigital number, since it uses as much as digits as its factorization.

6444521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 26.

The square root of 6444521 is about 2538.6061135986. The cubic root of 6444521 is about 186.0930759352.

Adding to 6444521 its reverse (1254446), we get a palindrome (7698967).

It can be divided in two parts, 64 and 44521, that multiplied together give a square (2849344 = 1688²).

The spelling of 6444521 in words is "six million, four hundred forty-four thousand, five hundred twenty-one".