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251228 = 22181347
BaseRepresentation
bin111101010101011100
3110202121202
4331111130
531014403
65215032
72064305
oct752534
9422552
10251228
1116182a
12101478
138a473
14677ac
154e688
hex3d55c

251228 has 12 divisors (see below), whose sum is σ = 443352. Its totient is φ = 124560.

The previous prime is 251221. The next prime is 251231. The reversal of 251228 is 822152.

It is a plaindrome in base 14.

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, 551 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (36946).

2251228 is an apocalyptic number.

It is an amenable number.

251228 is a deficient number, since it is larger than the sum of its proper divisors (192124).

251228 is a wasteful number, since it uses less digits than its factorization.

251228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 530 counting only the distinct ones).

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

The square root of 251228 is about 501.2264957083. The cubic root of 251228 is about 63.0990296071.

The spelling of 251228 in words is "two hundred fifty-one thousand, two hundred twenty-eight".

Divisors: 1 2 4 181 347 362 694 724 1388 62807 125614 251228