6447121 has 2 divisors, whose sum is σ = 6447122. Its totient is φ = 6447120.

The previous prime is 6447113. The next prime is 6447149. The reversal of 6447121 is 1217446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 96721 = 2520^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 6447121 - 2³ = 6447113 is a prime.

It is not a weakly prime, because it can be changed into another prime (6447421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223560 + 3223561.

It is an arithmetic number, because the mean of its divisors is an integer number (3223561).

Almost surely, 2^6447121 is an apocalyptic number.

It is an amenable number.

6447121 is a deficient number, since it is larger than the sum of its proper divisors (1).

6447121 is an equidigital number, since it uses as much as digits as its factorization.

6447121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 6447121 is about 2539.1181540054. The cubic root of 6447121 is about 186.1180985834.

It can be divided in two parts, 6447 and 121, that multiplied together give a palindrome (780087).

The spelling of 6447121 in words is "six million, four hundred forty-seven thousand, one hundred twenty-one".