1312311113 has 4 divisors (see below), whose sum is σ = 1319642640. Its totient is φ = 1304979588.

The previous prime is 1312311101. The next prime is 1312311137. The reversal of 1312311113 is 3111132131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3111132131 = 31 ⋅100359101.

It is a cyclic number.

It is not a de Polignac number, because 1312311113 - 2⁴ = 1312311097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312311091 and 1312311100.

It is not an unprimeable number, because it can be changed into a prime (1312311173) 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, 3665495 + ... + 3665852.

It is an arithmetic number, because the mean of its divisors is an integer number (329910660).

Almost surely, 2^1312311113 is an apocalyptic number.

It is an amenable number.

1312311113 is a deficient number, since it is larger than the sum of its proper divisors (7331527).

1312311113 is an equidigital number, since it uses as much as digits as its factorization.

1312311113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7331526.

The product of its digits is 54, while the sum is 17.

The square root of 1312311113 is about 36225.8348834088. The cubic root of 1312311113 is about 1094.8272596438.

Adding to 1312311113 its reverse (3111132131), we get a palindrome (4423443244).

The spelling of 1312311113 in words is "one billion, three hundred twelve million, three hundred eleven thousand, one hundred thirteen".