6604981 has 4 divisors (see below), whose sum is σ = 6783532. Its totient is φ = 6426432.

The previous prime is 6604973. The next prime is 6604987. The reversal of 6604981 is 1894066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1894066 = 2 ⋅947033.

It can be written as a sum of positive squares in 2 ways, for example, as 5924356 + 680625 = 2434^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 6604981 - 2³ = 6604973 is a prime.

It is a super-2 number, since 2×6604981² = 87251548020722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6604987) 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 3 ways as a sum of consecutive naturals, for example, 89220 + ... + 89293.

It is an arithmetic number, because the mean of its divisors is an integer number (1695883).

Almost surely, 2^6604981 is an apocalyptic number.

It is an amenable number.

6604981 is a deficient number, since it is larger than the sum of its proper divisors (178551).

6604981 is a wasteful number, since it uses less digits than its factorization.

6604981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178550.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 6604981 is about 2570.0157587065. The cubic root of 6604981 is about 187.6249217895.

Subtracting from 6604981 its reverse (1894066), we obtain a triangular number (4710915 = T₃₀₆₉).

It can be divided in two parts, 66049 and 81, that multiplied together give a square (5349969 = 2313²).

The spelling of 6604981 in words is "six million, six hundred four thousand, nine hundred eighty-one".