216612231 has 8 divisors (see below), whose sum is σ = 315072384. Its totient is φ = 131280120.

The previous prime is 216612203. The next prime is 216612251. The reversal of 216612231 is 132216612.

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

It is not a de Polignac number, because 216612231 - 2¹⁷ = 216481159 is a prime.

It is a super-2 number, since 2×216612231² = 93841717237594722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216612251) 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, 3281971 + ... + 3282036.

It is an arithmetic number, because the mean of its divisors is an integer number (39384048).

Almost surely, 2^216612231 is an apocalyptic number.

216612231 is a deficient number, since it is larger than the sum of its proper divisors (98460153).

216612231 is a wasteful number, since it uses less digits than its factorization.

216612231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564021.

The product of its digits is 864, while the sum is 24.

The square root of 216612231 is about 14717.7522400671. The cubic root of 216612231 is about 600.5663458081.

Adding to 216612231 its reverse (132216612), we get a palindrome (348828843).

The spelling of 216612231 in words is "two hundred sixteen million, six hundred twelve thousand, two hundred thirty-one".