1312885745 has 4 divisors (see below), whose sum is σ = 1575462900. Its totient is φ = 1050308592.

The previous prime is 1312885711. The next prime is 1312885751. The reversal of 1312885745 is 5475882131.

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 777796321 + 535089424 = 27889^2 + 23132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312885745 - 2²⁰ = 1311837169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312885696 and 1312885705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131288570 + ... + 131288579.

It is an arithmetic number, because the mean of its divisors is an integer number (393865725).

Almost surely, 2^1312885745 is an apocalyptic number.

It is an amenable number.

1312885745 is a deficient number, since it is larger than the sum of its proper divisors (262577155).

1312885745 is an equidigital number, since it uses as much as digits as its factorization.

1312885745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262577154.

The product of its digits is 268800, while the sum is 44.

The square root of 1312885745 is about 36233.7652611483. The cubic root of 1312885745 is about 1094.9870365361.

The spelling of 1312885745 in words is "one billion, three hundred twelve million, eight hundred eighty-five thousand, seven hundred forty-five".