216539193 has 24 divisors (see below), whose sum is σ = 313635648. Its totient is φ = 132829632.

The previous prime is 216539189. The next prime is 216539221. The reversal of 216539193 is 391935612.

It is not a de Polignac number, because 216539193 - 2² = 216539189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (216539153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 246471 + ... + 247347.

It is an arithmetic number, because the mean of its divisors is an integer number (13068152).

Almost surely, 2^216539193 is an apocalyptic number.

It is an amenable number.

216539193 is a deficient number, since it is larger than the sum of its proper divisors (97096455).

216539193 is a wasteful number, since it uses less digits than its factorization.

216539193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 1380 counting only the distinct ones).

The product of its digits is 43740, while the sum is 39.

The square root of 216539193 is about 14715.2707416479. The cubic root of 216539193 is about 600.4988379307.

The spelling of 216539193 in words is "two hundred sixteen million, five hundred thirty-nine thousand, one hundred ninety-three".