1312813 has 2 divisors, whose sum is σ = 1312814. Its totient is φ = 1312812.

The previous prime is 1312789. The next prime is 1312823. The reversal of 1312813 is 3182131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1304164 + 8649 = 1142^2 + 93^2 .

It is an emirp because it is prime and its reverse (3182131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312813 - 2⁹ = 1312301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312823) 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, 656406 + 656407.

It is an arithmetic number, because the mean of its divisors is an integer number (656407).

2^1312813 is an apocalyptic number.

It is an amenable number.

1312813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312813 is an equidigital number, since it uses as much as digits as its factorization.

1312813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1312813 is about 1145.7805199950. The cubic root of 1312813 is about 109.4966812308.

Adding to 1312813 its reverse (3182131), we get a palindrome (4494944).

The spelling of 1312813 in words is "one million, three hundred twelve thousand, eight hundred thirteen".