1257271 has 4 divisors (see below), whose sum is σ = 1277944. Its totient is φ = 1236600.

The previous prime is 1257253. The next prime is 1257281. The reversal of 1257271 is 1727521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1257271 - 2⁵ = 1257239 is a prime.

It is a Duffinian number.

1257271 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257241) 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, 10245 + ... + 10366.

It is an arithmetic number, because the mean of its divisors is an integer number (319486).

2^1257271 is an apocalyptic number.

1257271 is a deficient number, since it is larger than the sum of its proper divisors (20673).

1257271 is an equidigital number, since it uses as much as digits as its factorization.

1257271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20672.

The product of its digits is 980, while the sum is 25.

The square root of 1257271 is about 1121.2809638980. The cubic root of 1257271 is about 107.9301960912.

It can be divided in two parts, 125 and 7271, that added together give a square (7396 = 86²).

The spelling of 1257271 in words is "one million, two hundred fifty-seven thousand, two hundred seventy-one".