6472721 has 2 divisors, whose sum is σ = 6472722. Its totient is φ = 6472720.

The previous prime is 6472679. The next prime is 6472723. The reversal of 6472721 is 1272746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4456321 + 2016400 = 2111^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 6472721 - 2⁶ = 6472657 is a prime.

It is a super-2 number, since 2×6472721² = 83792234287682, which contains 22 as substring.

Together with 6472723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6472723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3236360 + 3236361.

It is an arithmetic number, because the mean of its divisors is an integer number (3236361).

Almost surely, 2^6472721 is an apocalyptic number.

It is an amenable number.

6472721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6472721 is an equidigital number, since it uses as much as digits as its factorization.

6472721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 6472721 is about 2544.1542799131. The cubic root of 6472721 is about 186.3641169638.

The spelling of 6472721 in words is "six million, four hundred seventy-two thousand, seven hundred twenty-one".