12722161 has 8 divisors (see below), whose sum is σ = 12974400. Its totient is φ = 12471888.

The previous prime is 12722159. The next prime is 12722167. The reversal of 12722161 is 16122721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12722161 - 2¹ = 12722159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12722167) 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 7 ways as a sum of consecutive naturals, for example, 20940 + ... + 21538.

It is an arithmetic number, because the mean of its divisors is an integer number (1621800).

Almost surely, 2^12722161 is an apocalyptic number.

It is an amenable number.

12722161 is a deficient number, since it is larger than the sum of its proper divisors (252239).

12722161 is an equidigital number, since it uses as much as digits as its factorization.

12722161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its digits is 336, while the sum is 22.

The square root of 12722161 is about 3566.8138443154. The cubic root of 12722161 is about 233.4462825043.

Adding to 12722161 its reverse (16122721), we get a palindrome (28844882).

The spelling of 12722161 in words is "twelve million, seven hundred twenty-two thousand, one hundred sixty-one".