1271091 has 4 divisors (see below), whose sum is σ = 1694792. Its totient is φ = 847392.

The previous prime is 1271089. The next prime is 1271111. The reversal of 1271091 is 1901721.

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

It is not a de Polignac number, because 1271091 - 2¹ = 1271089 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 (1271051) 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, 211846 + ... + 211851.

It is an arithmetic number, because the mean of its divisors is an integer number (423698).

2^1271091 is an apocalyptic number.

1271091 is a deficient number, since it is larger than the sum of its proper divisors (423701).

1271091 is an equidigital number, since it uses as much as digits as its factorization.

1271091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423700.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 1271091 is about 1127.4267160219. The cubic root of 1271091 is about 108.3242143541.

The spelling of 1271091 in words is "one million, two hundred seventy-one thousand, ninety-one".