216341987 has 16 divisors (see below), whose sum is σ = 227791872. Its totient is φ = 205255680.

The previous prime is 216341977. The next prime is 216342011. The reversal of 216341987 is 789143612.

It is a cyclic number.

It is not a de Polignac number, because 216341987 - 2²⁰ = 215293411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216341927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337187 + ... + 337827.

It is an arithmetic number, because the mean of its divisors is an integer number (14236992).

Almost surely, 2^216341987 is an apocalyptic number.

216341987 is a deficient number, since it is larger than the sum of its proper divisors (11449885).

216341987 is a wasteful number, since it uses less digits than its factorization.

216341987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its digits is 72576, while the sum is 41.

The square root of 216341987 is about 14708.5684891494. The cubic root of 216341987 is about 600.3164876595.

The spelling of 216341987 in words is "two hundred sixteen million, three hundred forty-one thousand, nine hundred eighty-seven".