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205143521 = 1121695401
BaseRepresentation
bin11000011101000…
…11110111100001
3112022000101000012
430032203313201
5410004043041
632204534305
75040456032
oct1416436741
9468011005
10205143521
11a5886400
1258851395
13336684cb
141d360a89
15130233eb
hexc3a3de1

205143521 has 6 divisors (see below), whose sum is σ = 225488466. Its totient is φ = 186494000.

The previous prime is 205143517. The next prime is 205143527. The reversal of 205143521 is 125341502.

It can be written as a sum of positive squares in only one way, i.e., 106915600 + 98227921 = 10340^2 + 9911^2 .

It is not a de Polignac number, because 205143521 - 22 = 205143517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205143527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 847580 + ... + 847821.

It is an arithmetic number, because the mean of its divisors is an integer number (37581411).

Almost surely, 2205143521 is an apocalyptic number.

It is an amenable number.

205143521 is a deficient number, since it is larger than the sum of its proper divisors (20344945).

205143521 is a wasteful number, since it uses less digits than its factorization.

205143521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695423 (or 1695412 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 205143521 is about 14322.8321570840. The cubic root of 205143521 is about 589.7744239642.

The spelling of 205143521 in words is "two hundred five million, one hundred forty-three thousand, five hundred twenty-one".

Divisors: 1 11 121 1695401 18649411 205143521