6635961 has 12 divisors (see below), whose sum is σ = 9624420. Its totient is φ = 4405920.

The previous prime is 6635957. The next prime is 6635963. The reversal of 6635961 is 1695366.

6635961 is a `hidden beast` number, since 6 + 63 + 596 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 5546025 = 1044^2 + 2355^2 .

It is not a de Polignac number, because 6635961 - 2² = 6635957 is a prime.

6635961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6635963) 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 11 ways as a sum of consecutive naturals, for example, 1051 + ... + 3791.

It is an arithmetic number, because the mean of its divisors is an integer number (802035).

Almost surely, 2^6635961 is an apocalyptic number.

It is an amenable number.

6635961 is a deficient number, since it is larger than the sum of its proper divisors (2988459).

6635961 is a wasteful number, since it uses less digits than its factorization.

6635961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016 (or 3013 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 6635961 is about 2576.0359081348. The cubic root of 6635961 is about 187.9178096291.

The spelling of 6635961 in words is "six million, six hundred thirty-five thousand, nine hundred sixty-one".