1131271 has 2 divisors, whose sum is σ = 1131272. Its totient is φ = 1131270.

The previous prime is 1131269. The next prime is 1131307. The reversal of 1131271 is 1721311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131271 - 2¹ = 1131269 is a prime.

Together with 1131269, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565635 + 565636.

It is an arithmetic number, because the mean of its divisors is an integer number (565636).

2^1131271 is an apocalyptic number.

1131271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131271 is an equidigital number, since it uses as much as digits as its factorization.

1131271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42, while the sum is 16.

The square root of 1131271 is about 1063.6122413737. The cubic root of 1131271 is about 104.1970806835.

Adding to 1131271 its reverse (1721311), we get a palindrome (2852582).

The spelling of 1131271 in words is "one million, one hundred thirty-one thousand, two hundred seventy-one".