1312031013 has 4 divisors (see below), whose sum is σ = 1749374688. Its totient is φ = 874687340.

The previous prime is 1312031009. The next prime is 1312031023. The reversal of 1312031013 is 3101302131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1312031013 - 2² = 1312031009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312030983 and 1312031001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312031023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218671833 + ... + 218671838.

It is an arithmetic number, because the mean of its divisors is an integer number (437343672).

Almost surely, 2^1312031013 is an apocalyptic number.

It is an amenable number.

1312031013 is a deficient number, since it is larger than the sum of its proper divisors (437343675).

1312031013 is an equidigital number, since it uses as much as digits as its factorization.

1312031013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437343674.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1312031013 is about 36221.9686516346. The cubic root of 1312031013 is about 1094.7493607033.

Adding to 1312031013 its reverse (3101302131), we get a palindrome (4413333144).

The spelling of 1312031013 in words is "one billion, three hundred twelve million, thirty-one thousand, thirteen".