11620813 has 4 divisors (see below), whose sum is σ = 11628828. Its totient is φ = 11612800.

The previous prime is 11620801. The next prime is 11620823. The reversal of 11620813 is 31802611.

11620813 is digitally balanced in base 2, 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3337929 + 8282884 = 1827^2 + 2878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11620813 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11620823) 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, 1156 + ... + 4957.

It is an arithmetic number, because the mean of its divisors is an integer number (2907207).

Almost surely, 2^11620813 is an apocalyptic number.

It is an amenable number.

11620813 is a deficient number, since it is larger than the sum of its proper divisors (8015).

11620813 is an equidigital number, since it uses as much as digits as its factorization.

11620813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8014.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 11620813 is about 3408.9313574785. The cubic root of 11620813 is about 226.5055446178.

It can be divided in two parts, 1162081 and 3, that added together give a square (1162084 = 1078²).

The spelling of 11620813 in words is "eleven million, six hundred twenty thousand, eight hundred thirteen".