1312509 has 16 divisors (see below), whose sum is σ = 1972224. Its totient is φ = 769200.

The previous prime is 1312471. The next prime is 1312513. The reversal of 1312509 is 9052131.

It is not a de Polignac number, because 1312509 - 2¹² = 1308413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (123264).

2^1312509 is an apocalyptic number.

It is an amenable number.

1312509 is a deficient number, since it is larger than the sum of its proper divisors (659715).

1312509 is a wasteful number, since it uses less digits than its factorization.

1312509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 1312509 is about 1145.6478516543. The cubic root of 1312509 is about 109.4882287549.

The spelling of 1312509 in words is "one million, three hundred twelve thousand, five hundred nine".