12170161 has 4 divisors (see below), whose sum is σ = 12453232. Its totient is φ = 11887092.

The previous prime is 12170149. The next prime is 12170167. The reversal of 12170161 is 16107121.

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: 16107121 = 379 ⋅42499.

It is not a de Polignac number, because 12170161 - 2⁷ = 12170033 is a prime.

It is a super-2 number, since 2×12170161² = 296225637531842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12170167) 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, 141471 + ... + 141556.

It is an arithmetic number, because the mean of its divisors is an integer number (3113308).

Almost surely, 2^12170161 is an apocalyptic number.

It is an amenable number.

12170161 is a deficient number, since it is larger than the sum of its proper divisors (283071).

12170161 is an equidigital number, since it uses as much as digits as its factorization.

12170161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283070.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 12170161 is about 3488.5757838981. The cubic root of 12170161 is about 230.0199163598.

Adding to 12170161 its reverse (16107121), we get a palindrome (28277282).

The spelling of 12170161 in words is "twelve million, one hundred seventy thousand, one hundred sixty-one".