12012311 has 4 divisors (see below), whose sum is σ = 12041400. Its totient is φ = 11983224.

The previous prime is 12012289. The next prime is 12012331. The reversal of 12012311 is 11321021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12012311 - 2¹⁴ = 11995927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012292 and 12012301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012331) 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, 13916 + ... + 14753.

It is an arithmetic number, because the mean of its divisors is an integer number (3010350).

Almost surely, 2^12012311 is an apocalyptic number.

12012311 is a deficient number, since it is larger than the sum of its proper divisors (29089).

12012311 is an equidigital number, since it uses as much as digits as its factorization.

12012311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29088.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12012311 is about 3465.8780994143. The cubic root of 12012311 is about 229.0211138469.

Adding to 12012311 its reverse (11321021), we get a palindrome (23333332).

The spelling of 12012311 in words is "twelve million, twelve thousand, three hundred eleven".