| Base | Representation |
|---|---|
| bin | 100100000110110… |
| … | …0111101100010000 |
| 3 | 10010102201002201111 |
| 4 | 1020031213230100 |
| 5 | 4440122430000 |
| 6 | 320115143104 |
| 7 | 42010556302 |
| oct | 11015475420 |
| 9 | 3112632644 |
| 10 | 1211530000 |
| 11 | 57197146a |
| 12 | 2998a4a94 |
| 13 | 164000575 |
| 14 | b6c91972 |
| 15 | 71566cba |
| hex | 48367b10 |
1211530000 has 100 divisors (see below), whose sum is σ = 2965847500. Its totient is φ = 479232000.
The previous prime is 1211529989. The next prime is 1211530009. The reversal of 1211530000 is 351121.
It can be written as a sum of positive squares in 10 ways, for example, as 1000583424 + 210946576 = 31632^2 + 14524^2 .
It is a tau number, because it is divible by the number of its divisors (100).
It is not an unprimeable number, because it can be changed into a prime (1211530009) 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 19 ways as a sum of consecutive naturals, for example, 969376 + ... + 970624.
It is an arithmetic number, because the mean of its divisors is an integer number (29658475).
Almost surely, 21211530000 is an apocalyptic number.
1211530000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1211530000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1482923750).
1211530000 is an abundant number, since it is smaller than the sum of its proper divisors (1754317500).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1211530000 is an equidigital number, since it uses as much as digits as its factorization.
1211530000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1374 (or 1353 counting only the distinct ones).
The product of its (nonzero) digits is 30, while the sum is 13.
The square root of 1211530000 is about 34807.0395178906. The cubic root of 1211530000 is about 1066.0511857262.
Adding to 1211530000 its reverse (351121), we get a palindrome (1211881121).
The spelling of 1211530000 in words is "one billion, two hundred eleven million, five hundred thirty thousand".
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