216992255 has 16 divisors (see below), whose sum is σ = 276670080. Its totient is φ = 162912672.

The previous prime is 216992249. The next prime is 216992257. The reversal of 216992255 is 552299612.

It is a cyclic number.

It is not a de Polignac number, because 216992255 - 2¹² = 216988159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216992257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509 + ... + 20838.

It is an arithmetic number, because the mean of its divisors is an integer number (17291880).

Almost surely, 2^216992255 is an apocalyptic number.

216992255 is a deficient number, since it is larger than the sum of its proper divisors (59677825).

216992255 is a wasteful number, since it uses less digits than its factorization.

216992255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21478.

The product of its digits is 97200, while the sum is 41.

The square root of 216992255 is about 14730.6569778812. The cubic root of 216992255 is about 600.9173513590.

The spelling of 216992255 in words is "two hundred sixteen million, nine hundred ninety-two thousand, two hundred fifty-five".