216625 has 8 divisors (see below), whose sum is σ = 270504. Its totient is φ = 173200.

The previous prime is 216617. The next prime is 216641. The reversal of 216625 is 526612.

216625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12321 + 204304 = 111^2 + 452^2 .

It is not a de Polignac number, because 216625 - 2³ = 216617 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 216596 and 216605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742 + ... + 991.

It is an arithmetic number, because the mean of its divisors is an integer number (33813).

2²¹⁶⁶²⁵ is an apocalyptic number.

216625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216625 is a deficient number, since it is larger than the sum of its proper divisors (53879).

216625 is an equidigital number, since it uses as much as digits as its factorization.

216625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1738 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 216625 is about 465.4299087940. The cubic root of 216625 is about 60.0578146436.

It can be divided in two parts, 216 and 625, that added together give a square (841 = 29²).

The spelling of 216625 in words is "two hundred sixteen thousand, six hundred twenty-five".