12261161 has 4 divisors (see below), whose sum is σ = 13375824. Its totient is φ = 11146500.

The previous prime is 12261157. The next prime is 12261163. The reversal of 12261161 is 16116221.

12261161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12261161 - 2² = 12261157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12261163) 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, 557315 + ... + 557336.

It is an arithmetic number, because the mean of its divisors is an integer number (3343956).

Almost surely, 2^12261161 is an apocalyptic number.

12261161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12261161 is a deficient number, since it is larger than the sum of its proper divisors (1114663).

12261161 is a wasteful number, since it uses less digits than its factorization.

12261161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114662.

The product of its digits is 144, while the sum is 20.

The square root of 12261161 is about 3501.5940655650. The cubic root of 12261161 is about 230.5918029836.

Adding to 12261161 its reverse (16116221), we get a palindrome (28377382).

The spelling of 12261161 in words is "twelve million, two hundred sixty-one thousand, one hundred sixty-one".