Search a number
306181 = 532109
BaseRepresentation
bin1001010110000000101
3120120000001
41022300011
534244211
610321301
72413441
oct1126005
9516001
10306181
1119a047
12129231
13a9495
147d821
1560ac1
hex4ac05

306181 has 6 divisors (see below), whose sum is σ = 314930. Its totient is φ = 297648.

The previous prime is 306169. The next prime is 306191. The reversal of 306181 is 181603.

Adding to 306181 its reverse (181603), we get a palindrome (487784).

It can be written as a sum of positive squares in 3 ways, for example, as 133956 + 172225 = 366^2 + 415^2 .

It is not a de Polignac number, because 306181 - 25 = 306149 is a prime.

It is a super-2 number, since 2×3061812 = 187493609522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2755 + ... + 2863.

It is a 35-hyperperfect number.

2306181 is an apocalyptic number.

It is an amenable number.

306181 is a deficient number, since it is larger than the sum of its proper divisors (8749).

306181 is an equidigital number, since it uses as much as digits as its factorization.

306181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 306181 is about 553.3362449723. The cubic root of 306181 is about 67.3999248620.

The spelling of 306181 in words is "three hundred six thousand, one hundred eighty-one".

Divisors: 1 53 109 2809 5777 306181