1312142123 has 4 divisors (see below), whose sum is σ = 1334381880. Its totient is φ = 1289902368.

The previous prime is 1312142089. The next prime is 1312142141. The reversal of 1312142123 is 3212412131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3212412131 = 3169 ⋅1013699.

It is not a de Polignac number, because 1312142123 - 2¹² = 1312138027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312142095 and 1312142104.

It is not an unprimeable number, because it can be changed into a prime (1212142123) 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, 11119790 + ... + 11119907.

It is an arithmetic number, because the mean of its divisors is an integer number (333595470).

Almost surely, 2^1312142123 is an apocalyptic number.

1312142123 is a deficient number, since it is larger than the sum of its proper divisors (22239757).

1312142123 is an equidigital number, since it uses as much as digits as its factorization.

1312142123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22239756.

The product of its digits is 288, while the sum is 20.

The square root of 1312142123 is about 36223.5023568953. The cubic root of 1312142123 is about 1094.7802629627.

Adding to 1312142123 its reverse (3212412131), we get a palindrome (4524554254).

The spelling of 1312142123 in words is "one billion, three hundred twelve million, one hundred forty-two thousand, one hundred twenty-three".