216231293 has 8 divisors (see below), whose sum is σ = 229240320. Its totient is φ = 203599440.

The previous prime is 216231289. The next prime is 216231307. The reversal of 216231293 is 392132612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216231293 - 2² = 216231289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216231593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93113 + ... + 95406.

It is an arithmetic number, because the mean of its divisors is an integer number (28655040).

Almost surely, 2^216231293 is an apocalyptic number.

It is an amenable number.

216231293 is a deficient number, since it is larger than the sum of its proper divisors (13009027).

216231293 is a wasteful number, since it uses less digits than its factorization.

216231293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188587.

The product of its digits is 3888, while the sum is 29.

The square root of 216231293 is about 14704.8050990144. The cubic root of 216231293 is about 600.2140837897.

The spelling of 216231293 in words is "two hundred sixteen million, two hundred thirty-one thousand, two hundred ninety-three".