1312013321 has 2 divisors, whose sum is σ = 1312013322. Its totient is φ = 1312013320.

The previous prime is 1312013293. The next prime is 1312013371. The reversal of 1312013321 is 1233102131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1220524096 + 91489225 = 34936^2 + 9565^2 .

It is an emirp because it is prime and its reverse (1233102131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312013321 - 2²⁶ = 1244904457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312013321.

It is not a weakly prime, because it can be changed into another prime (1312013371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656006660 + 656006661.

It is an arithmetic number, because the mean of its divisors is an integer number (656006661).

Almost surely, 2^1312013321 is an apocalyptic number.

It is an amenable number.

1312013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312013321 is an equidigital number, since it uses as much as digits as its factorization.

1312013321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1312013321 is about 36221.7244343778. The cubic root of 1312013321 is about 1094.7444399881.

Adding to 1312013321 its reverse (1233102131), we get a palindrome (2545115452).

The spelling of 1312013321 in words is "one billion, three hundred twelve million, thirteen thousand, three hundred twenty-one".