213655 has 16 divisors (see below), whose sum is σ = 292320. Its totient is φ = 148608.

The previous prime is 213649. The next prime is 213659. The reversal of 213655 is 556312.

It is a happy number.

213655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 213655 - 2⁵ = 213623 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213659) 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, 1149 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (18270).

2²¹³⁶⁵⁵ is an apocalyptic number.

213655 is a deficient number, since it is larger than the sum of its proper divisors (78665).

213655 is a wasteful number, since it uses less digits than its factorization.

213655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its digits is 900, while the sum is 22.

The square root of 213655 is about 462.2282985712. The cubic root of 213655 is about 59.7820798420.

Adding to 213655 its reverse (556312), we get a palindrome (769967).

It can be divided in two parts, 213 and 655, that added together give a palindrome (868).

The spelling of 213655 in words is "two hundred thirteen thousand, six hundred fifty-five".