1311857 has 2 divisors, whose sum is σ = 1311858. Its totient is φ = 1311856.

The previous prime is 1311853. The next prime is 1311899. The reversal of 1311857 is 7581131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732736 + 579121 = 856^2 + 761^2 .

It is an emirp because it is prime and its reverse (7581131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311857 - 2² = 1311853 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1311853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655928 + 655929.

It is an arithmetic number, because the mean of its divisors is an integer number (655929).

2^1311857 is an apocalyptic number.

It is an amenable number.

1311857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311857 is an equidigital number, since it uses as much as digits as its factorization.

1311857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 26.

The square root of 1311857 is about 1145.3632611534. The cubic root of 1311857 is about 109.4700960160.

Adding to 1311857 its reverse (7581131), we get a palindrome (8892988).

The spelling of 1311857 in words is "one million, three hundred eleven thousand, eight hundred fifty-seven".