11921663 has 4 divisors (see below), whose sum is σ = 12838728. Its totient is φ = 11004600.

The previous prime is 11921633. The next prime is 11921669. The reversal of 11921663 is 36612911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11921663 - 2¹⁰ = 11920639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458513 + ... + 458538.

It is an arithmetic number, because the mean of its divisors is an integer number (3209682).

Almost surely, 2^11921663 is an apocalyptic number.

11921663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11921663 is a deficient number, since it is larger than the sum of its proper divisors (917065).

11921663 is an equidigital number, since it uses as much as digits as its factorization.

11921663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917064.

The product of its digits is 1944, while the sum is 29.

The square root of 11921663 is about 3452.7761294356. The cubic root of 11921663 is about 228.4435744974.

The spelling of 11921663 in words is "eleven million, nine hundred twenty-one thousand, six hundred sixty-three".