1271289 has 4 divisors (see below), whose sum is σ = 1695056. Its totient is φ = 847524.

The previous prime is 1271251. The next prime is 1271293. The reversal of 1271289 is 9821721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1271289 - 2⁷ = 1271161 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271239) 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 3 ways as a sum of consecutive naturals, for example, 211879 + ... + 211884.

It is an arithmetic number, because the mean of its divisors is an integer number (423764).

2^1271289 is an apocalyptic number.

It is an amenable number.

1271289 is a deficient number, since it is larger than the sum of its proper divisors (423767).

1271289 is an equidigital number, since it uses as much as digits as its factorization.

1271289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423766.

The product of its digits is 2016, while the sum is 30.

The square root of 1271289 is about 1127.5145231881. The cubic root of 1271289 is about 108.3298386775.

The spelling of 1271289 in words is "one million, two hundred seventy-one thousand, two hundred eighty-nine".