12013161 has 4 divisors (see below), whose sum is σ = 16017552. Its totient is φ = 8008772.

The previous prime is 12013117. The next prime is 12013189. The reversal of 12013161 is 16131021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16131021 = 3 ⋅5377007.

It is a cyclic number.

It is not a de Polignac number, because 12013161 - 2⁶ = 12013097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12013161.

It is not an unprimeable number, because it can be changed into a prime (12013361) 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, 2002191 + ... + 2002196.

It is an arithmetic number, because the mean of its divisors is an integer number (4004388).

Almost surely, 2^12013161 is an apocalyptic number.

It is an amenable number.

12013161 is a deficient number, since it is larger than the sum of its proper divisors (4004391).

12013161 is an equidigital number, since it uses as much as digits as its factorization.

12013161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004390.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 12013161 is about 3466.0007212925. Note that the first 3 decimals coincide. The cubic root of 12013161 is about 229.0265156205.

Adding to 12013161 its reverse (16131021), we get a palindrome (28144182).

The spelling of 12013161 in words is "twelve million, thirteen thousand, one hundred sixty-one".