1317287 has 4 divisors (see below), whose sum is σ = 1337016. Its totient is φ = 1297560.

The previous prime is 1317271. The next prime is 1317299. The reversal of 1317287 is 7827131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7827131 = 13 ⋅602087.

It is a cyclic number.

It is not a de Polignac number, because 1317287 - 2⁴ = 1317271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317227) 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, 9764 + ... + 9897.

It is an arithmetic number, because the mean of its divisors is an integer number (334254).

2^1317287 is an apocalyptic number.

1317287 is a deficient number, since it is larger than the sum of its proper divisors (19729).

1317287 is an equidigital number, since it uses as much as digits as its factorization.

1317287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19728.

The product of its digits is 2352, while the sum is 29.

The square root of 1317287 is about 1147.7312403172. The cubic root of 1317287 is about 109.6209265722.

The spelling of 1317287 in words is "one million, three hundred seventeen thousand, two hundred eighty-seven".