12111813 has 12 divisors (see below), whose sum is σ = 19994208. Its totient is φ = 6921000.

The previous prime is 12111811. The next prime is 12111817. The reversal of 12111813 is 31811121.

It is a happy number.

It is not a de Polignac number, because 12111813 - 2¹ = 12111811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96063 + ... + 96188.

It is an arithmetic number, because the mean of its divisors is an integer number (1666184).

Almost surely, 2^12111813 is an apocalyptic number.

It is an amenable number.

12111813 is a deficient number, since it is larger than the sum of its proper divisors (7882395).

12111813 is a wasteful number, since it uses less digits than its factorization.

12111813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192264 (or 192261 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 12111813 is about 3480.2030113199. The cubic root of 12111813 is about 229.6517287345.

Adding to 12111813 its reverse (31811121), we get a palindrome (43922934).

The spelling of 12111813 in words is "twelve million, one hundred eleven thousand, eight hundred thirteen".