1312815785 has 16 divisors (see below), whose sum is σ = 1608266880. Its totient is φ = 1028465280.

The previous prime is 1312815743. The next prime is 1312815787. The reversal of 1312815785 is 5875182131.

It is not a de Polignac number, because 1312815785 - 2¹⁴ = 1312799401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312815787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69125 + ... + 86045.

It is an arithmetic number, because the mean of its divisors is an integer number (100516680).

Almost surely, 2^1312815785 is an apocalyptic number.

It is an amenable number.

1312815785 is a deficient number, since it is larger than the sum of its proper divisors (295451095).

1312815785 is a wasteful number, since it uses less digits than its factorization.

1312815785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17248.

The product of its digits is 67200, while the sum is 41.

The square root of 1312815785 is about 36232.7998504118. The cubic root of 1312815785 is about 1094.9675865943.

The spelling of 1312815785 in words is "one billion, three hundred twelve million, eight hundred fifteen thousand, seven hundred eighty-five".