216145 has 8 divisors (see below), whose sum is σ = 262080. Its totient is φ = 171120.

The previous prime is 216133. The next prime is 216149. The reversal of 216145 is 541612.

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

It is not a de Polignac number, because 216145 - 2⁵ = 216113 is a prime.

It is a super-2 number, since 2×216145² = 93437322050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

216145 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216149) 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, 540 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2²¹⁶¹⁴⁵ is an apocalyptic number.

It is an amenable number.

216145 is a deficient number, since it is larger than the sum of its proper divisors (45935).

216145 is a wasteful number, since it uses less digits than its factorization.

216145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455.

The product of its digits is 240, while the sum is 19.

The square root of 216145 is about 464.9139705365. The cubic root of 216145 is about 60.0134229228.

Adding to 216145 its reverse (541612), we get a palindrome (757757).

It can be divided in two parts, 216 and 145, that added together give a square (361 = 19²).

The spelling of 216145 in words is "two hundred sixteen thousand, one hundred forty-five".