1271559 has 4 divisors (see below), whose sum is σ = 1695416. Its totient is φ = 847704.

The previous prime is 1271551. The next prime is 1271561. The reversal of 1271559 is 9551721.

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

It is not a de Polignac number, because 1271559 - 2³ = 1271551 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211924 + ... + 211929.

It is an arithmetic number, because the mean of its divisors is an integer number (423854).

2^1271559 is an apocalyptic number.

1271559 is a deficient number, since it is larger than the sum of its proper divisors (423857).

1271559 is an equidigital number, since it uses as much as digits as its factorization.

1271559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423856.

The product of its digits is 3150, while the sum is 30.

The square root of 1271559 is about 1127.6342492138. The cubic root of 1271559 is about 108.3375072685.

It can be divided in two parts, 1271 and 559, that added together give a triangular number (1830 = T₆₀).

The spelling of 1271559 in words is "one million, two hundred seventy-one thousand, five hundred fifty-nine".