12771245 has 4 divisors (see below), whose sum is σ = 15325500. Its totient is φ = 10216992.

The previous prime is 12771221. The next prime is 12771271. The reversal of 12771245 is 54217721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2569609 + 10201636 = 1603^2 + 3194^2 .

It is a cyclic number.

It is not a de Polignac number, because 12771245 - 2²² = 8576941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277120 + ... + 1277129.

It is an arithmetic number, because the mean of its divisors is an integer number (3831375).

Almost surely, 2^12771245 is an apocalyptic number.

It is an amenable number.

12771245 is a deficient number, since it is larger than the sum of its proper divisors (2554255).

12771245 is an equidigital number, since it uses as much as digits as its factorization.

12771245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554254.

The product of its digits is 3920, while the sum is 29.

The square root of 12771245 is about 3573.6878710934. The cubic root of 12771245 is about 233.7461207855.

Adding to 12771245 its reverse (54217721), we get a palindrome (66988966).

The spelling of 12771245 in words is "twelve million, seven hundred seventy-one thousand, two hundred forty-five".