6620947 has 2 divisors, whose sum is σ = 6620948. Its totient is φ = 6620946.

The previous prime is 6620927. The next prime is 6620951. The reversal of 6620947 is 7490266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6620947 - 2⁷ = 6620819 is a prime.

It is an Ulam number.

6620947 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6620927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310473 + 3310474.

It is an arithmetic number, because the mean of its divisors is an integer number (3310474).

Almost surely, 2^6620947 is an apocalyptic number.

6620947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620947 is an equidigital number, since it uses as much as digits as its factorization.

6620947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 6620947 is about 2573.1200904738. The cubic root of 6620947 is about 187.7759799581.

The spelling of 6620947 in words is "six million, six hundred twenty thousand, nine hundred forty-seven".