12772161 has 40 divisors (see below), whose sum is σ = 20657120. Its totient is φ = 7838208.

The previous prime is 12772159. The next prime is 12772169. The reversal of 12772161 is 16127721.

It is not a de Polignac number, because 12772161 - 2¹ = 12772159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12772169) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 66081 + ... + 66273.

It is an arithmetic number, because the mean of its divisors is an integer number (516428).

Almost surely, 2^12772161 is an apocalyptic number.

It is an amenable number.

12772161 is a deficient number, since it is larger than the sum of its proper divisors (7884959).

12772161 is a wasteful number, since it uses less digits than its factorization.

12772161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 258 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 12772161 is about 3573.8160277216. The cubic root of 12772161 is about 233.7517090250.

Adding to 12772161 its reverse (16127721), we get a palindrome (28899882).

The spelling of 12772161 in words is "twelve million, seven hundred seventy-two thousand, one hundred sixty-one".