251224 has 16 divisors (see below), whose sum is σ = 486720. Its totient is φ = 121440.

The previous prime is 251221. The next prime is 251231. The reversal of 251224 is 422152.

It is a super-2 number, since 2×251224² = 126226996352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251198 and 251207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251221) 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, 259 + ... + 754.

It is an arithmetic number, because the mean of its divisors is an integer number (30420).

2²⁵¹²²⁴ is an apocalyptic number.

It is an amenable number.

251224 is a deficient number, since it is larger than the sum of its proper divisors (235496).

251224 is a wasteful number, since it uses less digits than its factorization.

251224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1046 counting only the distinct ones).

The product of its digits is 160, while the sum is 16.

The square root of 251224 is about 501.2225054804. Note that the first 3 decimals coincide. The cubic root of 251224 is about 63.0986947221.

Adding to 251224 its reverse (422152), we get a palindrome (673376).

The spelling of 251224 in words is "two hundred fifty-one thousand, two hundred twenty-four".