11821317 has 4 divisors (see below), whose sum is σ = 15761760. Its totient is φ = 7880876.

The previous prime is 11821301. The next prime is 11821331. The reversal of 11821317 is 71312811.

It is a happy number.

11821317 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 11821317 - 2⁴ = 11821301 is a prime.

It is a super-2 number, since 2×11821317² = 279487071228978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821367) 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, 1970217 + ... + 1970222.

It is an arithmetic number, because the mean of its divisors is an integer number (3940440).

Almost surely, 2^11821317 is an apocalyptic number.

It is an amenable number.

11821317 is a deficient number, since it is larger than the sum of its proper divisors (3940443).

11821317 is an equidigital number, since it uses as much as digits as its factorization.

11821317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940442.

The product of its digits is 336, while the sum is 24.

The square root of 11821317 is about 3438.2142167119. The cubic root of 11821317 is about 227.8008225126.

The spelling of 11821317 in words is "eleven million, eight hundred twenty-one thousand, three hundred seventeen".