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225161 is a prime number
BaseRepresentation
bin110110111110001001
3102102212022
4312332021
524201121
64454225
71625306
oct667611
9372768
10225161
11144192
12aa375
137b641
145c0ad
1546aab
hex36f89

225161 has 2 divisors, whose sum is σ = 225162. Its totient is φ = 225160.

The previous prime is 225157. The next prime is 225163. The reversal of 225161 is 161522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115600 + 109561 = 340^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 225161 - 22 = 225157 is a prime.

Together with 225163, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (225163) 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 as a sum of consecutive naturals, namely, 112580 + 112581.

It is an arithmetic number, because the mean of its divisors is an integer number (112581).

2225161 is an apocalyptic number.

It is an amenable number.

225161 is a deficient number, since it is larger than the sum of its proper divisors (1).

225161 is an equidigital number, since it uses as much as digits as its factorization.

225161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 17.

The square root of 225161 is about 474.5113275782. The cubic root of 225161 is about 60.8365236750.

Adding to 225161 its reverse (161522), we get a palindrome (386683).

The spelling of 225161 in words is "two hundred twenty-five thousand, one hundred sixty-one".