12226513 has 4 divisors (see below), whose sum is σ = 13167028. Its totient is φ = 11286000.

The previous prime is 12226507. The next prime is 12226537. The reversal of 12226513 is 31562221.

12226513 = 2472² + 2473².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31562221 = 37 ⋅853033.

It can be written as a sum of positive squares in 2 ways, for example, as 6115729 + 6110784 = 2473^2 + 2472^2 .

It is a cyclic number.

It is not a de Polignac number, because 12226513 - 2¹⁷ = 12095441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12226573) 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, 470238 + ... + 470263.

It is an arithmetic number, because the mean of its divisors is an integer number (3291757).

Almost surely, 2^12226513 is an apocalyptic number.

12226513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12226513 is the 2473-rd centered square number.

It is an amenable number.

12226513 is a deficient number, since it is larger than the sum of its proper divisors (940515).

12226513 is an equidigital number, since it uses as much as digits as its factorization.

12226513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940514.

The product of its digits is 720, while the sum is 22.

The square root of 12226513 is about 3496.6431044646. The cubic root of 12226513 is about 230.3743933834.

Adding to 12226513 its reverse (31562221), we get a palindrome (43788734).

The spelling of 12226513 in words is "twelve million, two hundred twenty-six thousand, five hundred thirteen".