1217317016887 has 4 divisors (see below), whose sum is σ = 1234462327056. Its totient is φ = 1200171706720.

The previous prime is 1217317016869. The next prime is 1217317016891. The reversal of 1217317016887 is 7886107137121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1217317016887 - 2²³ = 1217308628279 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 (1217317016857) 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, 8572654978 + ... + 8572655119.

It is an arithmetic number, because the mean of its divisors is an integer number (308615581764).

Almost surely, 2^{1217317016887} is an apocalyptic number.

1217317016887 is a deficient number, since it is larger than the sum of its proper divisors (17145310169).

1217317016887 is an equidigital number, since it uses as much as digits as its factorization.

1217317016887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17145310168.

The product of its (nonzero) digits is 790272, while the sum is 52.

The spelling of 1217317016887 in words is "one trillion, two hundred seventeen billion, three hundred seventeen million, sixteen thousand, eight hundred eighty-seven".