6630981 has 16 divisors (see below), whose sum is σ = 10636800. Its totient is φ = 3589488.

The previous prime is 6630979. The next prime is 6630983. The reversal of 6630981 is 1890366.

It is an interprime number because it is at equal distance from previous prime (6630979) and next prime (6630983).

It is not a de Polignac number, because 6630981 - 2¹ = 6630979 is a prime.

It is a super-2 number, since 2×6630981² = 87939818044722, which contains 22 as substring.

6630981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6630983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7911 + ... + 8708.

It is an arithmetic number, because the mean of its divisors is an integer number (664800).

Almost surely, 2^6630981 is an apocalyptic number.

It is an amenable number.

6630981 is a deficient number, since it is larger than the sum of its proper divisors (4005819).

6630981 is a wasteful number, since it uses less digits than its factorization.

6630981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16648.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 6630981 is about 2575.0691252858. The cubic root of 6630981 is about 187.8707898184.

The spelling of 6630981 in words is "six million, six hundred thirty thousand, nine hundred eighty-one".