1391271 has 16 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 785664.

The previous prime is 1391267. The next prime is 1391281. The reversal of 1391271 is 1721931.

It is not a de Polignac number, because 1391271 - 2² = 1391267 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1696 + ... + 2378.

It is an arithmetic number, because the mean of its divisors is an integer number (134064).

2^1391271 is an apocalyptic number.

1391271 is a deficient number, since it is larger than the sum of its proper divisors (753753).

1391271 is an equidigital number, since it uses as much as digits as its factorization.

1391271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790.

The product of its digits is 378, while the sum is 24.

The square root of 1391271 is about 1179.5215131569. The cubic root of 1391271 is about 111.6359084613.

It can be divided in two parts, 139127 and 1, that added together give a triangular number (139128 = T₅₂₇).

The spelling of 1391271 in words is "one million, three hundred ninety-one thousand, two hundred seventy-one".