12270161 has 4 divisors (see below), whose sum is σ = 12693300. Its totient is φ = 11847024.

The previous prime is 12270157. The next prime is 12270169. The reversal of 12270161 is 16107221.

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 2660161 + 9610000 = 1631^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 12270161 - 2² = 12270157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12270169) 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 3 ways as a sum of consecutive naturals, for example, 211526 + ... + 211583.

It is an arithmetic number, because the mean of its divisors is an integer number (3173325).

Almost surely, 2^12270161 is an apocalyptic number.

It is an amenable number.

12270161 is a deficient number, since it is larger than the sum of its proper divisors (423139).

12270161 is an equidigital number, since it uses as much as digits as its factorization.

12270161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423138.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 12270161 is about 3502.8789587995. The cubic root of 12270161 is about 230.6482092422.

Adding to 12270161 its reverse (16107221), we get a palindrome (28377382).

The spelling of 12270161 in words is "twelve million, two hundred seventy thousand, one hundred sixty-one".