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285013 = 2571109
BaseRepresentation
bin1000101100101010101
3112110222001
41011211111
533110023
610035301
72264641
oct1054525
9473861
10285013
11185153
12118b31
139c961
1475c21
15596ad
hex45955

285013 has 4 divisors (see below), whose sum is σ = 286380. Its totient is φ = 283648.

The previous prime is 285007. The next prime is 285023. The reversal of 285013 is 310582.

Adding to 285013 its reverse (310582), we get a palindrome (595595).

It can be divided in two parts, 28 and 5013, that added together give a square (5041 = 712).

285013 = 3772 + 3782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310582 = 2155291.

It can be written as a sum of positive squares in 2 ways, for example, as 142884 + 142129 = 378^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 285013 - 213 = 276821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285023) 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, 298 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (71595).

2285013 is an apocalyptic number.

285013 is the 378-th centered square number.

It is an amenable number.

285013 is a deficient number, since it is larger than the sum of its proper divisors (1367).

285013 is a wasteful number, since it uses less digits than its factorization.

285013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 285013 is about 533.8660880783. The cubic root of 285013 is about 65.8094442334.

The spelling of 285013 in words is "two hundred eighty-five thousand, thirteen".

Divisors: 1 257 1109 285013