1312787709 has 16 divisors (see below), whose sum is σ = 1954751040. Its totient is φ = 870745680.

The previous prime is 1312787683. The next prime is 1312787741. The reversal of 1312787709 is 9077872131.

It is not a de Polignac number, because 1312787709 - 2¹⁷ = 1312656637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312787759) 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, 118087 + ... + 128724.

It is an arithmetic number, because the mean of its divisors is an integer number (122171940).

Almost surely, 2^1312787709 is an apocalyptic number.

It is an amenable number.

1312787709 is a deficient number, since it is larger than the sum of its proper divisors (641963331).

1312787709 is a wasteful number, since it uses less digits than its factorization.

1312787709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247017 (or 247011 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 1312787709 is about 36232.4124093332. The cubic root of 1312787709 is about 1094.9597808459.

The spelling of 1312787709 in words is "one billion, three hundred twelve million, seven hundred eighty-seven thousand, seven hundred nine".