6475721 has 4 divisors (see below), whose sum is σ = 7400832. Its totient is φ = 5550612.

The previous prime is 6475717. The next prime is 6475739. The reversal of 6475721 is 1275746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1275746 = 2 ⋅637873.

It is a cyclic number.

It is not a de Polignac number, because 6475721 - 2² = 6475717 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6475741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462545 + ... + 462558.

It is an arithmetic number, because the mean of its divisors is an integer number (1850208).

Almost surely, 2^6475721 is an apocalyptic number.

It is an amenable number.

6475721 is a deficient number, since it is larger than the sum of its proper divisors (925111).

6475721 is an equidigital number, since it uses as much as digits as its factorization.

6475721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925110.

The product of its digits is 11760, while the sum is 32.

The square root of 6475721 is about 2544.7437984992. The cubic root of 6475721 is about 186.3929047537.

The spelling of 6475721 in words is "six million, four hundred seventy-five thousand, seven hundred twenty-one".