6498721 has 2 divisors, whose sum is σ = 6498722. Its totient is φ = 6498720.

The previous prime is 6498707. The next prime is 6498727. The reversal of 6498721 is 1278946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6305121 + 193600 = 2511^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6498721 is a prime.

It is not a weakly prime, because it can be changed into another prime (6498727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3249360 + 3249361.

It is an arithmetic number, because the mean of its divisors is an integer number (3249361).

Almost surely, 2^6498721 is an apocalyptic number.

It is an amenable number.

6498721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6498721 is an equidigital number, since it uses as much as digits as its factorization.

6498721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 6498721 is about 2549.2589119193. The cubic root of 6498721 is about 186.6133163154.

The spelling of 6498721 in words is "six million, four hundred ninety-eight thousand, seven hundred twenty-one".