Base | Representation |
---|---|
bin | 1111101001000… |
… | …00100100011101 |
3 | 100010212220222110 |
4 | 13310200210131 |
5 | 232042033110 |
6 | 21004104233 |
7 | 3152141022 |
oct | 764404435 |
9 | 303786873 |
10 | 131205405 |
11 | 68075621 |
12 | 37b35079 |
13 | 2124b346 |
14 | 135d5549 |
15 | b7baa20 |
hex | 7d2091d |
131205405 has 16 divisors (see below), whose sum is σ = 222277824. Its totient is φ = 65859840.
The previous prime is 131205391. The next prime is 131205419. The reversal of 131205405 is 504502131.
It is an interprime number because it is at equal distance from previous prime (131205391) and next prime (131205419).
It is not a de Polignac number, because 131205405 - 28 = 131205149 is a prime.
It is a congruent number.
It is an unprimeable number.
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 15 ways as a sum of consecutive naturals, for example, 257011 + ... + 257520.
It is an arithmetic number, because the mean of its divisors is an integer number (13892364).
Almost surely, 2131205405 is an apocalyptic number.
131205405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
131205405 is a deficient number, since it is larger than the sum of its proper divisors (91072419).
131205405 is a wasteful number, since it uses less digits than its factorization.
131205405 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 514556.
The product of its (nonzero) digits is 600, while the sum is 21.
The square root of 131205405 is about 11454.4927866755. The cubic root of 131205405 is about 508.1406148138.
Adding to 131205405 its reverse (504502131), we get a palindrome (635707536).
The spelling of 131205405 in words is "one hundred thirty-one million, two hundred five thousand, four hundred five".
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