216283491 has 24 divisors (see below), whose sum is σ = 319756320. Its totient is φ = 140832000.

The previous prime is 216283477. The next prime is 216283493. The reversal of 216283491 is 194382612.

216283491 is a `hidden beast` number, since 2 + 162 + 8 + 3 + 491 = 666.

216283491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216283491 - 2⁶ = 216283427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216283493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81595 + ... + 84203.

It is an arithmetic number, because the mean of its divisors is an integer number (13323180).

Almost surely, 2^216283491 is an apocalyptic number.

216283491 is a deficient number, since it is larger than the sum of its proper divisors (103472829).

216283491 is a wasteful number, since it uses less digits than its factorization.

216283491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827 (or 2824 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 216283491 is about 14706.5798539293. The cubic root of 216283491 is about 600.2623769139.

The spelling of 216283491 in words is "two hundred sixteen million, two hundred eighty-three thousand, four hundred ninety-one".