12209281 has 12 divisors (see below), whose sum is σ = 15039108. Its totient is φ = 9848832.

The previous prime is 12209273. The next prime is 12209321. The reversal of 12209281 is 18290221.

It can be written as a sum of positive squares in 2 ways, for example, as 11289600 + 919681 = 3360^2 + 959^2 .

It is not a de Polignac number, because 12209281 - 2³ = 12209273 is a prime.

It is a super-2 number, since 2×12209281² = 298133085073922, which contains 22 as substring.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (12209081) 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, 6496 + ... + 8161.

It is an arithmetic number, because the mean of its divisors is an integer number (1253259).

Almost surely, 2^12209281 is an apocalyptic number.

It is an amenable number.

12209281 is a deficient number, since it is larger than the sum of its proper divisors (2829827).

12209281 is a wasteful number, since it uses less digits than its factorization.

12209281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14688 (or 14681 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12209281 is about 3494.1781580223. The cubic root of 12209281 is about 230.2661129052.

It can be divided in two parts, 1220 and 9281, that added together give a palindrome (10501).

The spelling of 12209281 in words is "twelve million, two hundred nine thousand, two hundred eighty-one".