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BaseRepresentation
bin1000100100000100101
3112020221002
41010200211
532434423
610003045
72246054
oct1044045
9466832
10280613
11181913
12116485
139a958
147439b
1558228
hex44825

280613 has 2 divisors, whose sum is σ = 280614. Its totient is φ = 280612.

The previous prime is 280607. The next prime is 280627. The reversal of 280613 is 316082.

Adding to 280613 its reverse (316082), we get a palindrome (596695).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145924 + 134689 = 382^2 + 367^2 .

It is a cyclic number.

It is not a de Polignac number, because 280613 - 24 = 280597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140306 + 140307.

It is an arithmetic number, because the mean of its divisors is an integer number (140307).

2280613 is an apocalyptic number.

It is an amenable number.

280613 is a deficient number, since it is larger than the sum of its proper divisors (1).

280613 is an equidigital number, since it uses as much as digits as its factorization.

280613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 280613 is about 529.7291760891. The cubic root of 280613 is about 65.4690333974.

The spelling of 280613 in words is "two hundred eighty thousand, six hundred thirteen".