Base | Representation |
---|---|
bin | 1110101011011… |
… | …01110010011001 |
3 | 22120200210211111 |
4 | 13111231302121 |
5 | 223010224311 |
6 | 20115100321 |
7 | 3023420401 |
oct | 725556231 |
9 | 276623744 |
10 | 123133081 |
11 | 63561785 |
12 | 352a16a1 |
13 | 1c683016 |
14 | 124d3801 |
15 | ac23d21 |
hex | 756dc99 |
123133081 has 2 divisors, whose sum is σ = 123133082. Its totient is φ = 123133080.
The previous prime is 123133079. The next prime is 123133093. The reversal of 123133081 is 180331321.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 81000000 + 42133081 = 9000^2 + 6491^2 .
It is an emirp because it is prime and its reverse (180331321) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 123133081 - 21 = 123133079 is a prime.
It is a super-2 number, since 2×1231330812 = 30323511273105122, which contains 22 as substring.
Together with 123133079, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (123103081) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61566540 + 61566541.
It is an arithmetic number, because the mean of its divisors is an integer number (61566541).
Almost surely, 2123133081 is an apocalyptic number.
It is an amenable number.
123133081 is a deficient number, since it is larger than the sum of its proper divisors (1).
123133081 is an equidigital number, since it uses as much as digits as its factorization.
123133081 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 432, while the sum is 22.
The square root of 123133081 is about 11096.5346392466. The cubic root of 123133081 is about 497.4982783203.
The spelling of 123133081 in words is "one hundred twenty-three million, one hundred thirty-three thousand, eighty-one".
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