12272161 has 8 divisors (see below), whose sum is σ = 13714848. Its totient is φ = 10884000.

The previous prime is 12272159. The next prime is 12272167. The reversal of 12272161 is 16127221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12272161 - 2¹ = 12272159 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12272167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13155 + ... + 14056.

It is an arithmetic number, because the mean of its divisors is an integer number (1714356).

Almost surely, 2^12272161 is an apocalyptic number.

12272161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12272161 is a deficient number, since it is larger than the sum of its proper divisors (1442687).

12272161 is a wasteful number, since it uses less digits than its factorization.

12272161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27263.

The product of its digits is 336, while the sum is 22.

The square root of 12272161 is about 3503.1644266292. The cubic root of 12272161 is about 230.6607402203.

Adding to 12272161 its reverse (16127221), we get a palindrome (28399382).

The spelling of 12272161 in words is "twelve million, two hundred seventy-two thousand, one hundred sixty-one".