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228509 is a prime number
BaseRepresentation
bin110111110010011101
3102121110022
4313302131
524303014
64521525
71641131
oct676235
9377408
10228509
11146756
12b02a5
1380018
145d3c1
1547a8e
hex37c9d

228509 has 2 divisors, whose sum is σ = 228510. Its totient is φ = 228508.

The previous prime is 228479. The next prime is 228511. The reversal of 228509 is 905822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228484 + 25 = 478^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 228509 - 216 = 162973 is a prime.

Together with 228511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114254 + 114255.

It is an arithmetic number, because the mean of its divisors is an integer number (114255).

2228509 is an apocalyptic number.

It is an amenable number.

228509 is a deficient number, since it is larger than the sum of its proper divisors (1).

228509 is an equidigital number, since it uses as much as digits as its factorization.

228509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 228509 is about 478.0261499123. The cubic root of 228509 is about 61.1365747572.

It can be divided in two parts, 228 and 509, that added together give a palindrome (737).

The spelling of 228509 in words is "two hundred twenty-eight thousand, five hundred nine".