216091855 has 32 divisors (see below), whose sum is σ = 307445760. Its totient is φ = 142680960.

The previous prime is 216091849. The next prime is 216091867. The reversal of 216091855 is 558190612.

It is not a de Polignac number, because 216091855 - 2²³ = 207703247 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300186 + ... + 300904.

It is an arithmetic number, because the mean of its divisors is an integer number (9607680).

Almost surely, 2^216091855 is an apocalyptic number.

216091855 is a deficient number, since it is larger than the sum of its proper divisors (91353905).

216091855 is a wasteful number, since it uses less digits than its factorization.

216091855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 216091855 is about 14700.0630951027. The cubic root of 216091855 is about 600.0850388727.

The spelling of 216091855 in words is "two hundred sixteen million, ninety-one thousand, eight hundred fifty-five".