Search a number
281249 is a prime number
BaseRepresentation
bin1000100101010100001
3112021210122
41010222201
532444444
610010025
72250653
oct1045241
9467718
10281249
11182341
12116915
139b027
14746d3
15584ee
hex44aa1

281249 has 2 divisors, whose sum is σ = 281250. Its totient is φ = 281248.

The previous prime is 281243. The next prime is 281251. The reversal of 281249 is 942182.

It can be divided in two parts, 28124 and 9, that multiplied together give a triangular number (253116 = T711).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 115600 = 407^2 + 340^2 .

It is a cyclic number.

It is a trimorphic number since its cube, 22247077149281249, ends in 281249.

It is not a de Polignac number, because 281249 - 24 = 281233 is a prime.

Together with 281251, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281249.

It is not a weakly prime, because it can be changed into another prime (281243) 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 as a sum of consecutive naturals, namely, 140624 + 140625.

It is an arithmetic number, because the mean of its divisors is an integer number (140625).

2281249 is an apocalyptic number.

It is an amenable number.

281249 is a deficient number, since it is larger than the sum of its proper divisors (1).

281249 is an equidigital number, since it uses as much as digits as its factorization.

281249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 281249 is about 530.3291430800. The cubic root of 281249 is about 65.5184572035.

The spelling of 281249 in words is "two hundred eighty-one thousand, two hundred forty-nine".