1312011031 has 4 divisors (see below), whose sum is σ = 1315384200. Its totient is φ = 1308637864.

The previous prime is 1312011017. The next prime is 1312011049. The reversal of 1312011031 is 1301102131.

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 1312011031 - 2⁹ = 1312010519 is a prime.

It is a super-2 number, since 2×1312011031² = 3442745890931365922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312011061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686001 + ... + 1686778.

It is an arithmetic number, because the mean of its divisors is an integer number (328846050).

Almost surely, 2^1312011031 is an apocalyptic number.

1312011031 is a deficient number, since it is larger than the sum of its proper divisors (3373169).

1312011031 is an equidigital number, since it uses as much as digits as its factorization.

1312011031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373168.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1312011031 is about 36221.6928235001. The cubic root of 1312011031 is about 1094.7438030621.

Adding to 1312011031 its reverse (1301102131), we get a palindrome (2613113162).

The spelling of 1312011031 in words is "one billion, three hundred twelve million, eleven thousand, thirty-one".