6636121 has 4 divisors (see below), whose sum is σ = 6924672. Its totient is φ = 6347572.

The previous prime is 6636109. The next prime is 6636127. The reversal of 6636121 is 1216366.

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.

It is a cyclic number.

It is not a de Polignac number, because 6636121 - 2⁹ = 6635609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6636127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144241 + ... + 144286.

It is an arithmetic number, because the mean of its divisors is an integer number (1731168).

Almost surely, 2^6636121 is an apocalyptic number.

It is an amenable number.

6636121 is a deficient number, since it is larger than the sum of its proper divisors (288551).

6636121 is a wasteful number, since it uses less digits than its factorization.

6636121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288550.

The product of its digits is 1296, while the sum is 25.

The square root of 6636121 is about 2576.0669634154. The cubic root of 6636121 is about 187.9193199156.

The spelling of 6636121 in words is "six million, six hundred thirty-six thousand, one hundred twenty-one".