1311797 has 2 divisors, whose sum is σ = 1311798. Its totient is φ = 1311796.

The previous prime is 1311773. The next prime is 1311799. The reversal of 1311797 is 7971131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988036 + 323761 = 994^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311797 - 2⁶ = 1311733 is a prime.

It is a super-2 number, since 2×1311797² = 3441622738418, which contains 22 as substring.

Together with 1311799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311799) 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, 655898 + 655899.

It is an arithmetic number, because the mean of its divisors is an integer number (655899).

2^1311797 is an apocalyptic number.

It is an amenable number.

1311797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311797 is an equidigital number, since it uses as much as digits as its factorization.

1311797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323, while the sum is 29.

The square root of 1311797 is about 1145.3370682904. The cubic root of 1311797 is about 109.4684270572.

The spelling of 1311797 in words is "one million, three hundred eleven thousand, seven hundred ninety-seven".