1317271987 has 4 divisors (see below), whose sum is σ = 1317378280. Its totient is φ = 1317165696.

The previous prime is 1317271973. The next prime is 1317272009. The reversal of 1317271987 is 7891727131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7891727131 = 17 ⋅464219243.

It is a cyclic number.

It is not a de Polignac number, because 1317271987 - 2⁷ = 1317271859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317271687) 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, 31662 + ... + 60307.

It is an arithmetic number, because the mean of its divisors is an integer number (329344570).

Almost surely, 2^1317271987 is an apocalyptic number.

1317271987 is a deficient number, since it is larger than the sum of its proper divisors (106293).

1317271987 is an equidigital number, since it uses as much as digits as its factorization.

1317271987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106292.

The product of its digits is 148176, while the sum is 46.

The square root of 1317271987 is about 36294.2417884711. The cubic root of 1317271987 is about 1096.2051012409.

The spelling of 1317271987 in words is "one billion, three hundred seventeen million, two hundred seventy-one thousand, nine hundred eighty-seven".