11321813 has 8 divisors (see below), whose sum is σ = 12034008. Its totient is φ = 10614784.

The previous prime is 11321801. The next prime is 11321831. The reversal of 11321813 is 31812311.

11321813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8421604 + 2900209 = 2902^2 + 1703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11321813 - 2⁶ = 11321749 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 (11324813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3845 + ... + 6117.

It is an arithmetic number, because the mean of its divisors is an integer number (1504251).

Almost surely, 2^11321813 is an apocalyptic number.

It is an amenable number.

11321813 is a deficient number, since it is larger than the sum of its proper divisors (712195).

11321813 is a wasteful number, since it uses less digits than its factorization.

11321813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583.

The product of its digits is 144, while the sum is 20.

The square root of 11321813 is about 3364.7901866238. The cubic root of 11321813 is about 224.5460014232.

The spelling of 11321813 in words is "eleven million, three hundred twenty-one thousand, eight hundred thirteen".