12225971 has 4 divisors (see below), whose sum is σ = 12289512. Its totient is φ = 12162432.

The previous prime is 12225937. The next prime is 12225989. The reversal of 12225971 is 17952221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12225971 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 (12225901) 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, 31481 + ... + 31866.

It is an arithmetic number, because the mean of its divisors is an integer number (3072378).

Almost surely, 2^12225971 is an apocalyptic number.

12225971 is a deficient number, since it is larger than the sum of its proper divisors (63541).

12225971 is an equidigital number, since it uses as much as digits as its factorization.

12225971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63540.

The product of its digits is 2520, while the sum is 29.

The square root of 12225971 is about 3496.5656007002. The cubic root of 12225971 is about 230.3709891757.

The spelling of 12225971 in words is "twelve million, two hundred twenty-five thousand, nine hundred seventy-one".