251822 has 16 divisors (see below), whose sum is σ = 402192. Its totient is φ = 118080.

The previous prime is 251809. The next prime is 251831. The reversal of 251822 is 228152.

251822 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 251794 and 251803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2993 + ... + 3075.

It is an arithmetic number, because the mean of its divisors is an integer number (25137).

2²⁵¹⁸²² is an apocalyptic number.

251822 is a deficient number, since it is larger than the sum of its proper divisors (150370).

251822 is a wasteful number, since it uses less digits than its factorization.

251822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163.

The product of its digits is 320, while the sum is 20.

The square root of 251822 is about 501.8186923581. The cubic root of 251822 is about 63.1487206217.

Adding to 251822 its reverse (228152), we get a palindrome (479974).

The spelling of 251822 in words is "two hundred fifty-one thousand, eight hundred twenty-two".