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228731 is a prime number
BaseRepresentation
bin110111110101111011
3102121202112
4313311323
524304411
64522535
71641566
oct676573
9377675
10228731
11146938
12b044b
1380159
145d4dd
1547b8b
hex37d7b

228731 has 2 divisors, whose sum is σ = 228732. Its totient is φ = 228730.

The previous prime is 228713. The next prime is 228733. The reversal of 228731 is 137822.

Together with previous prime (228713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228731 - 210 = 227707 is a prime.

It is a super-2 number, since 2×2287312 = 104635740722, which contains 22 as substring.

Together with 228733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 228697 and 228706.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 228731.

It is not a weakly prime, because it can be changed into another prime (228733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114365 + 114366.

It is an arithmetic number, because the mean of its divisors is an integer number (114366).

2228731 is an apocalyptic number.

228731 is a deficient number, since it is larger than the sum of its proper divisors (1).

228731 is an equidigital number, since it uses as much as digits as its factorization.

228731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 228731 is about 478.2582984121. The cubic root of 228731 is about 61.1563667227.

Subtracting from 228731 its reverse (137822), we obtain a palindrome (90909).

It can be divided in two parts, 228 and 731, that added together give a palindrome (959).

The spelling of 228731 in words is "two hundred twenty-eight thousand, seven hundred thirty-one".