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259561 = 1132297
BaseRepresentation
bin111111010111101001
3111012001101
4333113221
531301221
65321401
72130511
oct772751
9435041
10259561
11168015
12106261
13911b3
146a841
1551d91
hex3f5e9

259561 has 4 divisors (see below), whose sum is σ = 261972. Its totient is φ = 257152.

The previous prime is 259547. The next prime is 259577. The reversal of 259561 is 165952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47961 + 211600 = 219^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 259561 - 217 = 128489 is a prime.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 259561 parts by 720 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (65493).

2259561 is an apocalyptic number.

It is an amenable number.

259561 is a deficient number, since it is larger than the sum of its proper divisors (2411).

259561 is a wasteful number, since it uses less digits than its factorization.

259561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its digits is 2700, while the sum is 28.

The square root of 259561 is about 509.4712945790. The cubic root of 259561 is about 63.7891007085.

It can be divided in two parts, 259 and 561, that added together give a triangular number (820 = T40).

The spelling of 259561 in words is "two hundred fifty-nine thousand, five hundred sixty-one".

Divisors: 1 113 2297 259561