Base | Representation |
---|---|
bin | 1111010110111… |
… | …11100001100111 |
3 | 22222102211202200 |
4 | 13223133201213 |
5 | 230440414311 |
6 | 20441305543 |
7 | 3123065106 |
oct | 753374147 |
9 | 288384680 |
10 | 128841831 |
11 | 66800858 |
12 | 371952b3 |
13 | 20901591 |
14 | 1317c03d |
15 | b4a0556 |
hex | 7adf867 |
128841831 has 12 divisors (see below), whose sum is σ = 195900120. Its totient is φ = 81373680.
The previous prime is 128841767. The next prime is 128841851. The reversal of 128841831 is 138148821.
It is not a de Polignac number, because 128841831 - 26 = 128841767 is a prime.
It is a super-2 number, since 2×1288418312 = 33200434830865122, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (128841851) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376560 + ... + 376901.
It is an arithmetic number, because the mean of its divisors is an integer number (16325010).
Almost surely, 2128841831 is an apocalyptic number.
128841831 is a deficient number, since it is larger than the sum of its proper divisors (67058289).
128841831 is a wasteful number, since it uses less digits than its factorization.
128841831 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 753486 (or 753483 counting only the distinct ones).
The product of its digits is 12288, while the sum is 36.
The square root of 128841831 is about 11350.8515539584. The cubic root of 128841831 is about 505.0708406323.
The spelling of 128841831 in words is "one hundred twenty-eight million, eight hundred forty-one thousand, eight hundred thirty-one".
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