6647081 has 4 divisors (see below), whose sum is σ = 7596672. Its totient is φ = 5697492.

The previous prime is 6647077. The next prime is 6647089. The reversal of 6647081 is 1807466.

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.

It is a cyclic number.

It is not a de Polignac number, because 6647081 - 2² = 6647077 is a prime.

It is a super-2 number, since 2×6647081² = 88367371641122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6647089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474785 + ... + 474798.

It is an arithmetic number, because the mean of its divisors is an integer number (1899168).

Almost surely, 2^6647081 is an apocalyptic number.

It is an amenable number.

6647081 is a deficient number, since it is larger than the sum of its proper divisors (949591).

6647081 is an equidigital number, since it uses as much as digits as its factorization.

6647081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949590.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6647081 is about 2578.1933596998. The cubic root of 6647081 is about 188.0227168113.

The spelling of 6647081 in words is "six million, six hundred forty-seven thousand, eighty-one".