1312078385 has 4 divisors (see below), whose sum is σ = 1574494068. Its totient is φ = 1049662704.

The previous prime is 1312078381. The next prime is 1312078399. The reversal of 1312078385 is 5838702131.

It is a happy number.

1312078385 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 764190736 + 547887649 = 27644^2 + 23407^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312078385 - 2² = 1312078381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312078381) 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, 131207834 + ... + 131207843.

It is an arithmetic number, because the mean of its divisors is an integer number (393623517).

Almost surely, 2^1312078385 is an apocalyptic number.

It is an amenable number.

1312078385 is a deficient number, since it is larger than the sum of its proper divisors (262415683).

1312078385 is an equidigital number, since it uses as much as digits as its factorization.

1312078385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262415682.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1312078385 is about 36222.6225582853. The cubic root of 1312078385 is about 1094.7625361649.

The spelling of 1312078385 in words is "one billion, three hundred twelve million, seventy-eight thousand, three hundred eighty-five".