216314681 has 16 divisors (see below), whose sum is σ = 250335360. Its totient is φ = 184730880.

The previous prime is 216314671. The next prime is 216314689. The reversal of 216314681 is 186413612.

It is a cyclic number.

It is not a de Polignac number, because 216314681 - 2¹⁸ = 216052537 is a prime.

It is a super-2 number, since 2×216314681² = 93584082432263522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216314689) 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, 163340 + ... + 164658.

It is an arithmetic number, because the mean of its divisors is an integer number (15645960).

Almost surely, 2^216314681 is an apocalyptic number.

It is an amenable number.

216314681 is a deficient number, since it is larger than the sum of its proper divisors (34020679).

216314681 is a wasteful number, since it uses less digits than its factorization.

216314681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224.

The product of its digits is 6912, while the sum is 32.

The square root of 216314681 is about 14707.6402254067. The cubic root of 216314681 is about 600.2912299153.

The spelling of 216314681 in words is "two hundred sixteen million, three hundred fourteen thousand, six hundred eighty-one".