6609961 has 4 divisors (see below), whose sum is σ = 6634624. Its totient is φ = 6585300.

The previous prime is 6609893. The next prime is 6609971. The reversal of 6609961 is 1699066.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1699066 = 2 ⋅849533.

It is not a de Polignac number, because 6609961 - 2⁷ = 6609833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6609961.

It is not an unprimeable number, because it can be changed into a prime (6609971) 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, 11925 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (1658656).

Almost surely, 2^6609961 is an apocalyptic number.

It is an amenable number.

6609961 is a deficient number, since it is larger than the sum of its proper divisors (24663).

6609961 is a wasteful number, since it uses less digits than its factorization.

6609961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24662.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 6609961 is about 2570.9844418043. The cubic root of 6609961 is about 187.6720648662.

The spelling of 6609961 in words is "six million, six hundred nine thousand, nine hundred sixty-one".