1312787459 has 4 divisors (see below), whose sum is σ = 1313056416. Its totient is φ = 1312518504.

The previous prime is 1312787449. The next prime is 1312787513. The reversal of 1312787459 is 9547872131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9547872131 = 7 ⋅1363981733.

It is a cyclic number.

It is not a de Polignac number, because 1312787459 - 2¹² = 1312783363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312787449) 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, 127019 + ... + 136964.

It is an arithmetic number, because the mean of its divisors is an integer number (328264104).

Almost surely, 2^1312787459 is an apocalyptic number.

1312787459 is a deficient number, since it is larger than the sum of its proper divisors (268957).

1312787459 is an equidigital number, since it uses as much as digits as its factorization.

1312787459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268956.

The product of its digits is 423360, while the sum is 47.

The square root of 1312787459 is about 36232.4089593833. The cubic root of 1312787459 is about 1094.9597113399.

The spelling of 1312787459 in words is "one billion, three hundred twelve million, seven hundred eighty-seven thousand, four hundred fifty-nine".