216351 has 10 divisors (see below), whose sum is σ = 323312. Its totient is φ = 144180.

The previous prime is 216347. The next prime is 216371. The reversal of 216351 is 153612.

It is not a de Polignac number, because 216351 - 2² = 216347 is a prime.

It is a Duffinian number.

216351 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216371) 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 9 ways as a sum of consecutive naturals, for example, 1255 + ... + 1416.

2²¹⁶³⁵¹ is an apocalyptic number.

216351 is a deficient number, since it is larger than the sum of its proper divisors (106961).

216351 is an equidigital number, since it uses as much as digits as its factorization.

216351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2674 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 216351 is about 465.1354641392. The cubic root of 216351 is about 60.0324824117.

Adding to 216351 its reverse (153612), we get a palindrome (369963).

The spelling of 216351 in words is "two hundred sixteen thousand, three hundred fifty-one".