6647951 has 2 divisors, whose sum is σ = 6647952. Its totient is φ = 6647950.

The previous prime is 6647947. The next prime is 6647959. The reversal of 6647951 is 1597466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6647951 - 2² = 6647947 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323975 + 3323976.

It is an arithmetic number, because the mean of its divisors is an integer number (3323976).

Almost surely, 2^6647951 is an apocalyptic number.

6647951 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647951 is an equidigital number, since it uses as much as digits as its factorization.

6647951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 6647951 is about 2578.3620769783. The cubic root of 6647951 is about 188.0309195410.

The spelling of 6647951 in words is "six million, six hundred forty-seven thousand, nine hundred fifty-one".