251216 has 20 divisors (see below), whose sum is σ = 556512. Its totient is φ = 107616.

The previous prime is 251203. The next prime is 251219. The reversal of 251216 is 612152.

251216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 251194 and 251203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010 + ... + 1233.

2²⁵¹²¹⁶ is an apocalyptic number.

It is an amenable number.

251216 is an abundant number, since it is smaller than the sum of its proper divisors (305296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251216 is a wasteful number, since it uses less digits than its factorization.

251216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258 (or 2252 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 251216 is about 501.2145249292. The cubic root of 251216 is about 63.0980249415.

Adding to 251216 its reverse (612152), we get a palindrome (863368).

The spelling of 251216 in words is "two hundred fifty-one thousand, two hundred sixteen".