11663121 has 4 divisors (see below), whose sum is σ = 15550832. Its totient is φ = 7775412.

The previous prime is 11663117. The next prime is 11663143. The reversal of 11663121 is 12136611.

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 not a de Polignac number, because 11663121 - 2² = 11663117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11663101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943851 + ... + 1943856.

It is an arithmetic number, because the mean of its divisors is an integer number (3887708).

Almost surely, 2^11663121 is an apocalyptic number.

It is an amenable number.

11663121 is a deficient number, since it is larger than the sum of its proper divisors (3887711).

11663121 is an equidigital number, since it uses as much as digits as its factorization.

11663121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887710.

The product of its digits is 216, while the sum is 21.

The square root of 11663121 is about 3415.1311834247. The cubic root of 11663121 is about 226.7800919727.

Adding to 11663121 its reverse (12136611), we get a palindrome (23799732).

The spelling of 11663121 in words is "eleven million, six hundred sixty-three thousand, one hundred twenty-one".