216024491 has 4 divisors (see below), whose sum is σ = 228731832. Its totient is φ = 203317152.

The previous prime is 216024481. The next prime is 216024493. The reversal of 216024491 is 194420612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216024491 - 2⁶ = 216024427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216024493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6353645 + ... + 6353678.

It is an arithmetic number, because the mean of its divisors is an integer number (57182958).

Almost surely, 2^216024491 is an apocalyptic number.

216024491 is a deficient number, since it is larger than the sum of its proper divisors (12707341).

216024491 is a wasteful number, since it uses less digits than its factorization.

216024491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12707340.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 216024491 is about 14697.7716338226. The cubic root of 216024491 is about 600.0226759948.

The spelling of 216024491 in words is "two hundred sixteen million, twenty-four thousand, four hundred ninety-one".