1312315121 has 4 divisors (see below), whose sum is σ = 1413262452. Its totient is φ = 1211367792.

The previous prime is 1312315093. The next prime is 1312315129. The reversal of 1312315121 is 1215132131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 505755121 + 806560000 = 22489^2 + 28400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312315121 - 2¹⁴ = 1312298737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312315093 and 1312315102.

It is not an unprimeable number, because it can be changed into a prime (1312315129) 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, 50473646 + ... + 50473671.

It is an arithmetic number, because the mean of its divisors is an integer number (353315613).

Almost surely, 2^1312315121 is an apocalyptic number.

It is an amenable number.

1312315121 is a deficient number, since it is larger than the sum of its proper divisors (100947331).

1312315121 is a wasteful number, since it uses less digits than its factorization.

1312315121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100947330.

The product of its digits is 180, while the sum is 20.

The square root of 1312315121 is about 36225.8902030026. The cubic root of 1312315121 is about 1094.8283742330.

Adding to 1312315121 its reverse (1215132131), we get a palindrome (2527447252).

The spelling of 1312315121 in words is "one billion, three hundred twelve million, three hundred fifteen thousand, one hundred twenty-one".