12205513 has 4 divisors (see below), whose sum is σ = 12268948. Its totient is φ = 12142080.

The previous prime is 12205511. The next prime is 12205553. The reversal of 12205513 is 31550221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3283344 + 8922169 = 1812^2 + 2987^2 .

It is a cyclic number.

It is not a de Polignac number, because 12205513 - 2¹ = 12205511 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 (12205511) 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, 31428 + ... + 31813.

It is an arithmetic number, because the mean of its divisors is an integer number (3067237).

Almost surely, 2^12205513 is an apocalyptic number.

It is an amenable number.

12205513 is a deficient number, since it is larger than the sum of its proper divisors (63435).

12205513 is an equidigital number, since it uses as much as digits as its factorization.

12205513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63434.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 12205513 is about 3493.6389338339. The cubic root of 12205513 is about 230.2424224033.

Adding to 12205513 its reverse (31550221), we get a palindrome (43755734).

The spelling of 12205513 in words is "twelve million, two hundred five thousand, five hundred thirteen".