12161611 has 16 divisors (see below), whose sum is σ = 15425280. Its totient is φ = 9312480.

The previous prime is 12161599. The next prime is 12161623. The reversal of 12161611 is 11616121.

12161611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12161599) and next prime (12161623).

It is a cyclic number.

It is not a de Polignac number, because 12161611 - 2⁷ = 12161483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12161651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3205 + ... + 5881.

It is an arithmetic number, because the mean of its divisors is an integer number (964080).

Almost surely, 2^12161611 is an apocalyptic number.

12161611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12161611 is a deficient number, since it is larger than the sum of its proper divisors (3263669).

12161611 is a wasteful number, since it uses less digits than its factorization.

12161611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754.

The product of its digits is 72, while the sum is 19.

The square root of 12161611 is about 3487.3501401494. The cubic root of 12161611 is about 229.9660378335.

Adding to 12161611 its reverse (11616121), we get a palindrome (23777732).

Subtracting from 12161611 its reverse (11616121), we obtain a triangular number (545490 = T₁₀₄₄).

It can be divided in two parts, 1 and 2161611, that added together give a palindrome (2161612).

The spelling of 12161611 in words is "twelve million, one hundred sixty-one thousand, six hundred eleven".