1231312212313 has 4 divisors (see below), whose sum is σ = 1231662318820. Its totient is φ = 1230962105808.

The previous prime is 1231312212293. The next prime is 1231312212331. The reversal of 1231312212313 is 3132122131321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1092501571984 + 138810640329 = 1045228^2 + 372573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231312212313 is a prime.

It is a super-2 number, since 2×1231312212313² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231312212353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175047978 + ... + 175055011.

It is an arithmetic number, because the mean of its divisors is an integer number (307915579705).

Almost surely, 2^{1231312212313} is an apocalyptic number.

It is an amenable number.

1231312212313 is a deficient number, since it is larger than the sum of its proper divisors (350106507).

1231312212313 is an equidigital number, since it uses as much as digits as its factorization.

1231312212313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350106506.

The product of its digits is 1296, while the sum is 25.

Adding to 1231312212313 its reverse (3132122131321), we get a palindrome (4363434343634).

The spelling of 1231312212313 in words is "one trillion, two hundred thirty-one billion, three hundred twelve million, two hundred twelve thousand, three hundred thirteen".