12211513 has 6 divisors (see below), whose sum is σ = 12409134.
Its totient is φ = 12014784.
The previous prime is 12211501. The next prime is 12211519. The reversal of 12211513 is 31511221.
Adding to 12211513 its reverse (31511221), we get a palindrome (43722734).
It can be written as a sum of positive squares in 3 ways, for example, as 7661824 + 4549689 = 2768^2 + 2133^2
It is a de Polignac number, because none of the positive numbers 2k-12211513 is a prime.
It is a Duffinian number.
It is a plaindrome in base 15.
It is not an unprimeable number, because it can be changed into a prime (12211519) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29653 + ... + 30061.
It is an arithmetic number, because the mean of its divisors is an integer number (2068189).
Almost surely, 212211513 is an apocalyptic number.
It is an amenable number.
12211513 is a deficient number, since it is larger than the sum of its proper divisors (197621).
12211513 is an frugal number, since it uses more digits than its factorization.
12211513 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 891 (or 482 counting only the distinct ones).
The product of its digits is 60, while the sum is 16.
The square root of 12211513 is about 3494.4975318349.
The cubic root of 12211513 is about 230.2801438338.
The spelling of 12211513 in words is "twelve million, two hundred eleven thousand, five hundred thirteen".