12161111 has 4 divisors (see below), whose sum is σ = 12170424. Its totient is φ = 12151800.

The previous prime is 12161099. The next prime is 12161113. The reversal of 12161111 is 11116121.

12161111 is digitally balanced in base 2, 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12161111 - 2⁶ = 12161047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161113) 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, 2300 + ... + 5441.

It is an arithmetic number, because the mean of its divisors is an integer number (3042606).

Almost surely, 2^12161111 is an apocalyptic number.

12161111 is a deficient number, since it is larger than the sum of its proper divisors (9313).

12161111 is an equidigital number, since it uses as much as digits as its factorization.

12161111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9312.

The product of its digits is 12, while the sum is 14.

The square root of 12161111 is about 3487.2784517443. The cubic root of 12161111 is about 229.9628862610.

Adding to 12161111 its reverse (11116121), we get a palindrome (23277232).

The spelling of 12161111 in words is "twelve million, one hundred sixty-one thousand, one hundred eleven".