325 can be written using four 4's:
See also 113
325 has 6
divisors (see below), whose sum is σ = 434
Its totient is φ = 240
The previous prime is 317. The next prime is 331. The reversal of 325 is 523.
325 is nontrivially palindromic in base 2, base 4 and base 8.
It is a Cunningham number, because it is equal to 182+1.
325 is a nontrivial binomial coefficient, being equal to C(26, 2).
It can be written as a sum of positive squares in 3 ways, for example, as 1 + 324 = 1^2 + 18^2
It is not a de Polignac number, because 325 - 23 = 317 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
325 is an undulating number in base 8.
It is a plaindrome in base 15 and base 16.
It is a nialpdrome in base 7.
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, 19 + ... + 31.
It is a 3-hyperperfect number.
325 is the 25-th triangular number, the 13-th hexagonal number and also the 10-th nonagonal number.
325 is the 9-th centered nonagonal number.
It is an amenable number.
325 is a deficient number, since it is larger than the sum of its proper divisors (109).
325 is a wasteful number, since it uses less digits than its factorization.
325 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 23 (or 18 counting only the distinct ones).
The product of its digits is 30, while the sum is 10.
The square root of 325 is about 18.0277563773.
The cubic root of 325 is about 6.8753443354.
Adding to 325 its reverse (523), we get a palindrome (848).
It can be divided in two parts, 3 and 25, that added together give a triangular number (28 = T7).
The spelling of 325 in words is "three hundred twenty-five", and thus it is an aban number and an oban number.