216987671 has 8 divisors (see below), whose sum is σ = 221336064. Its totient is φ = 212648800.

The previous prime is 216987613. The next prime is 216987679. The reversal of 216987671 is 176789612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216987671 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 (216987679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59225 + ... + 62781.

It is an arithmetic number, because the mean of its divisors is an integer number (27667008).

Almost surely, 2^216987671 is an apocalyptic number.

216987671 is a deficient number, since it is larger than the sum of its proper divisors (4348393).

216987671 is a wasteful number, since it uses less digits than its factorization.

216987671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761.

The product of its digits is 254016, while the sum is 47.

The square root of 216987671 is about 14730.5013831845. The cubic root of 216987671 is about 600.9131198338.

The spelling of 216987671 in words is "two hundred sixteen million, nine hundred eighty-seven thousand, six hundred seventy-one".