12229281 has 6 divisors (see below), whose sum is σ = 17664530. Its totient is φ = 8152848.

The previous prime is 12229267. The next prime is 12229289. The reversal of 12229281 is 18292221.

12229281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9979281 + 2250000 = 3159^2 + 1500^2 .

It is not a de Polignac number, because 12229281 - 2⁷ = 12229153 is a prime.

It is a super-2 number, since 2×12229281² = 299110627553922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12229289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 679396 + ... + 679413.

Almost surely, 2^12229281 is an apocalyptic number.

It is an amenable number.

12229281 is a deficient number, since it is larger than the sum of its proper divisors (5435249).

12229281 is a wasteful number, since it uses less digits than its factorization.

12229281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358815 (or 1358812 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12229281 is about 3497.0388902613. The cubic root of 12229281 is about 230.3917771407.

It can be divided in two parts, 122 and 29281, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 12229281 in words is "twelve million, two hundred twenty-nine thousand, two hundred eighty-one".