216155 has 8 divisors (see below), whose sum is σ = 274752. Its totient is φ = 162688.

The previous prime is 216149. The next prime is 216157. The reversal of 216155 is 551612.

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 216155 - 2⁶ = 216091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216157) 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, 1187 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (34344).

2²¹⁶¹⁵⁵ is an apocalyptic number.

216155 is a deficient number, since it is larger than the sum of its proper divisors (58597).

216155 is a wasteful number, since it uses less digits than its factorization.

216155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565.

The product of its digits is 300, while the sum is 20.

The square root of 216155 is about 464.9247250900. The cubic root of 216155 is about 60.0143484203.

Adding to 216155 its reverse (551612), we get a palindrome (767767).

The spelling of 216155 in words is "two hundred sixteen thousand, one hundred fifty-five".