12281911 has 4 divisors (see below), whose sum is σ = 12420000. Its totient is φ = 12143824.

The previous prime is 12281909. The next prime is 12281947. The reversal of 12281911 is 11918221.

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 12281911 - 2¹ = 12281909 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 (12281981) 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, 68911 + ... + 69088.

It is an arithmetic number, because the mean of its divisors is an integer number (3105000).

Almost surely, 2^12281911 is an apocalyptic number.

12281911 is a deficient number, since it is larger than the sum of its proper divisors (138089).

12281911 is an equidigital number, since it uses as much as digits as its factorization.

12281911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138088.

The product of its digits is 288, while the sum is 25.

The square root of 12281911 is about 3504.5557493069. Note that the first 3 decimals coincide. The cubic root of 12281911 is about 230.7218092502.

The spelling of 12281911 in words is "twelve million, two hundred eighty-one thousand, nine hundred eleven".