1312681387 has 8 divisors (see below), whose sum is σ = 1335865392. Its totient is φ = 1289551200.

The previous prime is 1312681373. The next prime is 1312681397. The reversal of 1312681387 is 7831862131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312681387 - 2¹¹ = 1312679339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312681397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37437 + ... + 63457.

It is an arithmetic number, because the mean of its divisors is an integer number (166983174).

Almost surely, 2^1312681387 is an apocalyptic number.

1312681387 is a deficient number, since it is larger than the sum of its proper divisors (23184005).

1312681387 is an equidigital number, since it uses as much as digits as its factorization.

1312681387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26909.

The product of its digits is 48384, while the sum is 40.

The square root of 1312681387 is about 36230.9451574203. The cubic root of 1312681387 is about 1094.9302199717.

The spelling of 1312681387 in words is "one billion, three hundred twelve million, six hundred eighty-one thousand, three hundred eighty-seven".