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225831 = 375277
BaseRepresentation
bin110111001000100111
3102110210010
4313020213
524211311
64501303
71630254
oct671047
9373703
10225831
11144741
12aa833
137ba38
145c42b
1546da6
hex37227

225831 has 4 divisors (see below), whose sum is σ = 301112. Its totient is φ = 150552.

The previous prime is 225829. The next prime is 225839. The reversal of 225831 is 138522.

225831 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 225831 - 21 = 225829 is a prime.

It is a super-2 number, since 2×2258312 = 101999281122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

225831 is strictly pandigital in base 7.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 225798 and 225807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37636 + ... + 37641.

It is an arithmetic number, because the mean of its divisors is an integer number (75278).

2225831 is an apocalyptic number.

225831 is a deficient number, since it is larger than the sum of its proper divisors (75281).

225831 is an equidigital number, since it uses as much as digits as its factorization.

225831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75280.

The product of its digits is 480, while the sum is 21.

The square root of 225831 is about 475.2167926326. The cubic root of 225831 is about 60.8968066250.

The spelling of 225831 in words is "two hundred twenty-five thousand, eight hundred thirty-one".

Divisors: 1 3 75277 225831