6456641 has 2 divisors, whose sum is σ = 6456642. Its totient is φ = 6456640.

The previous prime is 6456623. The next prime is 6456661. The reversal of 6456641 is 1466546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 5041 = 2540^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 6456641 - 2⁶ = 6456577 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6456598 and 6456607.

It is not a weakly prime, because it can be changed into another prime (6456661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3228320 + 3228321.

It is an arithmetic number, because the mean of its divisors is an integer number (3228321).

Almost surely, 2^6456641 is an apocalyptic number.

It is an amenable number.

6456641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6456641 is an equidigital number, since it uses as much as digits as its factorization.

6456641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 6456641 is about 2540.9921290708. The cubic root of 6456641 is about 186.2096626006.

The spelling of 6456641 in words is "six million, four hundred fifty-six thousand, six hundred forty-one".