251222 has 8 divisors (see below), whose sum is σ = 383400. Its totient is φ = 123424.

The previous prime is 251221. The next prime is 251231. The reversal of 251222 is 222152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×251222² = 126224986568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251197 and 251206.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947 + ... + 1182.

It is an arithmetic number, because the mean of its divisors is an integer number (47925).

2²⁵¹²²² is an apocalyptic number.

251222 is a deficient number, since it is larger than the sum of its proper divisors (132178).

251222 is a wasteful number, since it uses less digits than its factorization.

251222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190.

The product of its digits is 80, while the sum is 14.

The square root of 251222 is about 501.2205103545. The cubic root of 251222 is about 63.0985272783.

Adding to 251222 its reverse (222152), we get a palindrome (473374).

The spelling of 251222 in words is "two hundred fifty-one thousand, two hundred twenty-two".