216454231 has 16 divisors (see below), whose sum is σ = 256435200. Its totient is φ = 178764768.

The previous prime is 216454229. The next prime is 216454241. The reversal of 216454231 is 132454612.

It is not a de Polignac number, because 216454231 - 2¹ = 216454229 is a prime.

It is a super-2 number, since 2×216454231² = 93704868235602722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216454231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216454201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145216 + ... + 146698.

It is an arithmetic number, because the mean of its divisors is an integer number (16027200).

Almost surely, 2^216454231 is an apocalyptic number.

216454231 is a deficient number, since it is larger than the sum of its proper divisors (39980969).

216454231 is a wasteful number, since it uses less digits than its factorization.

216454231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238.

The product of its digits is 5760, while the sum is 28.

The square root of 216454231 is about 14712.3835934222. The cubic root of 216454231 is about 600.4202897847.

The spelling of 216454231 in words is "two hundred sixteen million, four hundred fifty-four thousand, two hundred thirty-one".