| Base | Representation |
|---|---|
| bin | 11000011110010… |
| … | …10011010000101 |
| 3 | 112022022101112212 |
| 4 | 30033022122011 |
| 5 | 410024121011 |
| 6 | 32212153205 |
| 7 | 5042014205 |
| oct | 1417123205 |
| 9 | 468271485 |
| 10 | 205301381 |
| 11 | a5983a6a |
| 12 | 58908805 |
| 13 | 336c230c |
| 14 | 1d3a2405 |
| 15 | 1305508b |
| hex | c3ca685 |
205301381 has 4 divisors (see below), whose sum is σ = 214227552. Its totient is φ = 196375212.
The previous prime is 205301359. The next prime is 205301429. The reversal of 205301381 is 183103502.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183103502 = 2 ⋅91551751.
It is a cyclic number.
It is not a de Polignac number, because 205301381 - 226 = 138192517 is a prime.
It is a super-2 number, since 2×2053013812 = 84297314081014322, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 8926147 = 205301381 / (2 + 0 + 5 + 3 + 0 + 1 + 3 + 8 + 1).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (205301581) 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, 4463051 + ... + 4463096.
It is an arithmetic number, because the mean of its divisors is an integer number (53556888).
Almost surely, 2205301381 is an apocalyptic number.
It is an amenable number.
205301381 is a deficient number, since it is larger than the sum of its proper divisors (8926171).
205301381 is an equidigital number, since it uses as much as digits as its factorization.
205301381 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8926170.
The product of its (nonzero) digits is 720, while the sum is 23.
The square root of 205301381 is about 14328.3418789475. The cubic root of 205301381 is about 589.9256642916.
Adding to 205301381 its reverse (183103502), we get a palindrome (388404883).
The spelling of 205301381 in words is "two hundred five million, three hundred one thousand, three hundred eighty-one".
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