11115813 has 4 divisors (see below), whose sum is σ = 14821088. Its totient is φ = 7410540.

The previous prime is 11115803. The next prime is 11115821. The reversal of 11115813 is 31851111.

It is a happy number.

11115813 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 Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11115813 - 2⁸ = 11115557 is a prime.

It is a super-2 number, since 2×11115813² = 247122597301938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11115813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11115803) 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, 1852633 + ... + 1852638.

It is an arithmetic number, because the mean of its divisors is an integer number (3705272).

Almost surely, 2^11115813 is an apocalyptic number.

It is an amenable number.

11115813 is a deficient number, since it is larger than the sum of its proper divisors (3705275).

11115813 is an equidigital number, since it uses as much as digits as its factorization.

11115813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705274.

The product of its digits is 120, while the sum is 21.

The square root of 11115813 is about 3334.0385420688. The cubic root of 11115813 is about 223.1757882487.

Adding to 11115813 its reverse (31851111), we get a palindrome (42966924).

The spelling of 11115813 in words is "eleven million, one hundred fifteen thousand, eight hundred thirteen".