1312331213 has 2 divisors, whose sum is σ = 1312331214. Its totient is φ = 1312331212.

The previous prime is 1312331183. The next prime is 1312331219. The reversal of 1312331213 is 3121332131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1202563684 + 109767529 = 34678^2 + 10477^2 .

It is an emirp because it is prime and its reverse (3121332131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312331213 - 2¹⁰ = 1312330189 is a prime.

It is a super-2 number, since 2×1312331213² = 3444426425228102738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312331219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656165606 + 656165607.

It is an arithmetic number, because the mean of its divisors is an integer number (656165607).

Almost surely, 2^1312331213 is an apocalyptic number.

It is an amenable number.

1312331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312331213 is an equidigital number, since it uses as much as digits as its factorization.

1312331213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 1312331213 is about 36226.1123086649. The cubic root of 1312331213 is about 1094.8328492522.

Adding to 1312331213 its reverse (3121332131), we get a palindrome (4433663344).

The spelling of 1312331213 in words is "one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred thirteen".