12771155 has 4 divisors (see below), whose sum is σ = 15325392. Its totient is φ = 10216920.

The previous prime is 12771151. The next prime is 12771191. The reversal of 12771155 is 55117721.

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

It is not a de Polignac number, because 12771155 - 2² = 12771151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12771151) 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, 1277111 + ... + 1277120.

It is an arithmetic number, because the mean of its divisors is an integer number (3831348).

Almost surely, 2^12771155 is an apocalyptic number.

12771155 is a deficient number, since it is larger than the sum of its proper divisors (2554237).

12771155 is an equidigital number, since it uses as much as digits as its factorization.

12771155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554236.

The product of its digits is 2450, while the sum is 29.

The square root of 12771155 is about 3573.6752790370. The cubic root of 12771155 is about 233.7455717083.

Adding to 12771155 its reverse (55117721), we get a palindrome (67888876).

The spelling of 12771155 in words is "twelve million, seven hundred seventy-one thousand, one hundred fifty-five".