216093281 has 4 divisors (see below), whose sum is σ = 223064064. Its totient is φ = 209122500.

The previous prime is 216093233. The next prime is 216093299. The reversal of 216093281 is 182390612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216093281 - 2⁶ = 216093217 is a prime.

It is a super-2 number, since 2×216093281² = 93392612186689922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216593281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3485345 + ... + 3485406.

It is an arithmetic number, because the mean of its divisors is an integer number (55766016).

Almost surely, 2^216093281 is an apocalyptic number.

It is an amenable number.

216093281 is a deficient number, since it is larger than the sum of its proper divisors (6970783).

216093281 is an equidigital number, since it uses as much as digits as its factorization.

216093281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6970782.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 216093281 is about 14700.1115982158. Note that the first 3 decimals coincide. The cubic root of 216093281 is about 600.0863588659.

The spelling of 216093281 in words is "two hundred sixteen million, ninety-three thousand, two hundred eighty-one".