12771289 has 4 divisors (see below), whose sum is σ = 12809524. Its totient is φ = 12733056.

The previous prime is 12771271. The next prime is 12771307. The reversal of 12771289 is 98217721.

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

It is an interprime number because it is at equal distance from previous prime (12771271) and next prime (12771307).

It can be written as a sum of positive squares in 2 ways, for example, as 1265625 + 11505664 = 1125^2 + 3392^2 .

It is a cyclic number.

It is not a de Polignac number, because 12771289 - 2¹³ = 12763097 is a prime.

It is a super-4 number, since 4×12771289⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12771089) 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, 18612 + ... + 19285.

It is an arithmetic number, because the mean of its divisors is an integer number (3202381).

Almost surely, 2^12771289 is an apocalyptic number.

It is an amenable number.

12771289 is a deficient number, since it is larger than the sum of its proper divisors (38235).

12771289 is an equidigital number, since it uses as much as digits as its factorization.

12771289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38234.

The product of its digits is 14112, while the sum is 37.

The square root of 12771289 is about 3573.6940271937. The cubic root of 12771289 is about 233.7463892223.

The spelling of 12771289 in words is "twelve million, seven hundred seventy-one thousand, two hundred eighty-nine".