6639461 has 4 divisors (see below), whose sum is σ = 6648300. Its totient is φ = 6630624.

The previous prime is 6639449. The next prime is 6639467. The reversal of 6639461 is 1649366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1649366 = 2 ⋅824683.

It can be written as a sum of positive squares in 2 ways, for example, as 4060225 + 2579236 = 2015^2 + 1606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6639461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639467) 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, 3176 + ... + 4833.

It is an arithmetic number, because the mean of its divisors is an integer number (1662075).

Almost surely, 2^6639461 is an apocalyptic number.

It is an amenable number.

6639461 is a deficient number, since it is larger than the sum of its proper divisors (8839).

6639461 is an equidigital number, since it uses as much as digits as its factorization.

6639461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8838.

The product of its digits is 23328, while the sum is 35.

The square root of 6639461 is about 2576.7151569392. The cubic root of 6639461 is about 187.9508416062.

The spelling of 6639461 in words is "six million, six hundred thirty-nine thousand, four hundred sixty-one".