1312223131231 has 4 divisors (see below), whose sum is σ = 1318884162552. Its totient is φ = 1305562099912.

The previous prime is 1312223131217. The next prime is 1312223131253. The reversal of 1312223131231 is 1321313222131.

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

It is a cyclic number.

It is not a de Polignac number, because 1312223131231 - 2¹³ = 1312223123039 is a prime.

It is a super-2 number, since 2×1312223131231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312223131196 and 1312223131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312223135231) 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, 3330515365 + ... + 3330515758.

It is an arithmetic number, because the mean of its divisors is an integer number (329721040638).

Almost surely, 2^{1312223131231} is an apocalyptic number.

1312223131231 is a deficient number, since it is larger than the sum of its proper divisors (6661031321).

1312223131231 is an equidigital number, since it uses as much as digits as its factorization.

1312223131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661031320.

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

Adding to 1312223131231 its reverse (1321313222131), we get a palindrome (2633536353362).

The spelling of 1312223131231 in words is "one trillion, three hundred twelve billion, two hundred twenty-three million, one hundred thirty-one thousand, two hundred thirty-one".