12281111 has 2 divisors, whose sum is σ = 12281112. Its totient is φ = 12281110.

The previous prime is 12281063. The next prime is 12281117. The reversal of 12281111 is 11118221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12281111 - 2¹⁰ = 12280087 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12281111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12281117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6140555 + 6140556.

It is an arithmetic number, because the mean of its divisors is an integer number (6140556).

Almost surely, 2^12281111 is an apocalyptic number.

12281111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12281111 is an equidigital number, since it uses as much as digits as its factorization.

12281111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 17.

The square root of 12281111 is about 3504.4416102997. The cubic root of 12281111 is about 230.7167996754.

Adding to 12281111 its reverse (11118221), we get a palindrome (23399332).

The spelling of 12281111 in words is "twelve million, two hundred eighty-one thousand, one hundred eleven".