12225511 has 4 divisors (see below), whose sum is σ = 12241224. Its totient is φ = 12209800.

The previous prime is 12225491. The next prime is 12225527. The reversal of 12225511 is 11552221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11552221 = 1999 ⋅5779.

It is a cyclic number.

It is not a de Polignac number, because 12225511 - 2¹⁵ = 12192743 is a prime.

It is a super-2 number, since 2×12225511² = 298926238422242, 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 (12225611) 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, 6625 + ... + 8266.

It is an arithmetic number, because the mean of its divisors is an integer number (3060306).

Almost surely, 2^12225511 is an apocalyptic number.

12225511 is a deficient number, since it is larger than the sum of its proper divisors (15713).

12225511 is an equidigital number, since it uses as much as digits as its factorization.

12225511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15712.

The product of its digits is 200, while the sum is 19.

The square root of 12225511 is about 3496.4998212498. The cubic root of 12225511 is about 230.3680999169.

Adding to 12225511 its reverse (11552221), we get a palindrome (23777732).

The spelling of 12225511 in words is "twelve million, two hundred twenty-five thousand, five hundred eleven".