1312112123 has 4 divisors (see below), whose sum is σ = 1499556720. Its totient is φ = 1124667528.

The previous prime is 1312112117. The next prime is 1312112143. The reversal of 1312112123 is 3212112131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3212112131 = 191 ⋅16817341.

It is a cyclic number.

It is not a de Polignac number, because 1312112123 - 2¹² = 1312108027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312112143) 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, 93722288 + ... + 93722301.

It is an arithmetic number, because the mean of its divisors is an integer number (374889180).

Almost surely, 2^1312112123 is an apocalyptic number.

1312112123 is a deficient number, since it is larger than the sum of its proper divisors (187444597).

1312112123 is an equidigital number, since it uses as much as digits as its factorization.

1312112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187444596.

The product of its digits is 72, while the sum is 17.

The square root of 1312112123 is about 36223.0882587335. The cubic root of 1312112123 is about 1094.7719194411.

Adding to 1312112123 its reverse (3212112131), we get a palindrome (4524224254).

The spelling of 1312112123 in words is "one billion, three hundred twelve million, one hundred twelve thousand, one hundred twenty-three".