1311241 has 2 divisors, whose sum is σ = 1311242. Its totient is φ = 1311240.

The previous prime is 1311239. The next prime is 1311251. The reversal of 1311241 is 1421131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 992016 + 319225 = 996^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311241 - 2¹ = 1311239 is a prime.

Together with 1311239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1311251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655620 + 655621.

It is an arithmetic number, because the mean of its divisors is an integer number (655621).

2^1311241 is an apocalyptic number.

It is an amenable number.

1311241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311241 is an equidigital number, since it uses as much as digits as its factorization.

1311241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 13.

The square root of 1311241 is about 1145.0943192593. The cubic root of 1311241 is about 109.4529589508.

Adding to 1311241 its reverse (1421131), we get a palindrome (2732372).

The spelling of 1311241 in words is "one million, three hundred eleven thousand, two hundred forty-one".