1312050521 has 4 divisors (see below), whose sum is σ = 1315767732. Its totient is φ = 1308333312.

The previous prime is 1312050517. The next prime is 1312050527. The reversal of 1312050521 is 1250502131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1250502131 = 11593 ⋅107867.

It can be written as a sum of positive squares in 2 ways, for example, as 328914496 + 983136025 = 18136^2 + 31355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312050521 - 2² = 1312050517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1312050493 and 1312050502.

It is not an unprimeable number, because it can be changed into a prime (1312050527) 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, 1858076 + ... + 1858781.

It is an arithmetic number, because the mean of its divisors is an integer number (328941933).

Almost surely, 2^1312050521 is an apocalyptic number.

It is an amenable number.

1312050521 is a deficient number, since it is larger than the sum of its proper divisors (3717211).

1312050521 is an equidigital number, since it uses as much as digits as its factorization.

1312050521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3717210.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1312050521 is about 36222.2379347273. The cubic root of 1312050521 is about 1094.7547864553.

Adding to 1312050521 its reverse (1250502131), we get a palindrome (2562552652).

The spelling of 1312050521 in words is "one billion, three hundred twelve million, fifty thousand, five hundred twenty-one".