Base | Representation |
---|---|
bin | 11001010001011… |
… | …01110100011111 |
3 | 112202220201101000 |
4 | 30220231310133 |
5 | 413233000111 |
6 | 33011521343 |
7 | 5152653615 |
oct | 1450556437 |
9 | 482821330 |
10 | 212000031 |
11 | a9739841 |
12 | 5abb9253 |
13 | 34bc9309 |
14 | 202276b5 |
15 | 13929c56 |
hex | ca2dd1f |
212000031 has 16 divisors (see below), whose sum is σ = 316188000. Its totient is φ = 140382144.
The previous prime is 212000029. The next prime is 212000057. The reversal of 212000031 is 130000212.
It is a happy number.
It is not a de Polignac number, because 212000031 - 21 = 212000029 is a prime.
It is a super-2 number, since 2×2120000312 = 89888026288001922, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 211999977 and 212000022.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (212000021) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22326 + ... + 30371.
It is an arithmetic number, because the mean of its divisors is an integer number (19761750).
Almost surely, 2212000031 is an apocalyptic number.
212000031 is a deficient number, since it is larger than the sum of its proper divisors (104187969).
212000031 is a wasteful number, since it uses less digits than its factorization.
212000031 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 52855 (or 52849 counting only the distinct ones).
The product of its (nonzero) digits is 12, while the sum is 9.
The square root of 212000031 is about 14560.2208431054. The cubic root of 212000031 is about 596.2732248380.
Adding to 212000031 its reverse (130000212), we get a palindrome (342000243).
The spelling of 212000031 in words is "two hundred twelve million, thirty-one", and thus it is an aban number.
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