216925 has 6 divisors (see below), whose sum is σ = 269018. Its totient is φ = 173520.
The previous prime is 216919. The next prime is 216947. The reversal of 216925 is 529612.
216925 is nontrivially palindromic in base 13.
It can be written as a sum of positive squares in 3 ways, for example, as 3481 + 213444 = 59^2 + 462^2 .
It is not a de Polignac number, because 216925 - 23 = 216917 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 8677 = 216925 / (2 + 1 + 6 + 9 + 2 + 5).
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 216925.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4314 + ... + 4363.
2216925 is an apocalyptic number.
216925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
It is an amenable number.
216925 is a deficient number, since it is larger than the sum of its proper divisors (52093).
216925 is an equidigital number, since it uses as much as digits as its factorization.
216925 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8687 (or 8682 counting only the distinct ones).
The product of its digits is 1080, while the sum is 25.
The square root of 216925 is about 465.7520799739. The cubic root of 216925 is about 60.0855261781.
The spelling of 216925 in words is "two hundred sixteen thousand, nine hundred twenty-five".
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