Base | Representation |
---|---|
bin | 111001101010… |
… | …0110101010001 |
3 | 2002212221100121 |
4 | 1303110311101 |
5 | 30214410024 |
6 | 2555550241 |
7 | 514652422 |
oct | 163246521 |
9 | 62787317 |
10 | 30231889 |
11 | 16079736 |
12 | a15b381 |
13 | 63566bc |
14 | 402d649 |
15 | 29c28e4 |
hex | 1cd4d51 |
30231889 has 4 divisors (see below), whose sum is σ = 30802356. Its totient is φ = 29661424.
The previous prime is 30231863. The next prime is 30231911. The reversal of 30231889 is 98813203.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98813203 = 233 ⋅424091.
It can be written as a sum of positive squares in 2 ways, for example, as 22724289 + 7507600 = 4767^2 + 2740^2 .
It is a cyclic number.
It is not a de Polignac number, because 30231889 - 221 = 28134737 is a prime.
It is a super-2 number, since 2×302318892 = 1827934225016642, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (30231829) 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, 285154 + ... + 285259.
It is an arithmetic number, because the mean of its divisors is an integer number (7700589).
Almost surely, 230231889 is an apocalyptic number.
It is an amenable number.
30231889 is a deficient number, since it is larger than the sum of its proper divisors (570467).
30231889 is an equidigital number, since it uses as much as digits as its factorization.
30231889 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 570466.
The product of its (nonzero) digits is 10368, while the sum is 34.
The square root of 30231889 is about 5498.3532989432. The cubic root of 30231889 is about 311.5217889115.
The spelling of 30231889 in words is "thirty million, two hundred thirty-one thousand, eight hundred eighty-nine".
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