Base | Representation |
---|---|
bin | 101100100110… |
… | …1011010110101 |
3 | 1122000010021001 |
4 | 1121031122311 |
5 | 21441321111 |
6 | 2153123301 |
7 | 402530056 |
oct | 131153265 |
9 | 48003231 |
10 | 23385781 |
11 | 122230a1 |
12 | 79b9531 |
13 | 4aca553 |
14 | 316a72d |
15 | 20be1c1 |
hex | 164d6b5 |
23385781 has 2 divisors, whose sum is σ = 23385782. Its totient is φ = 23385780.
The previous prime is 23385737. The next prime is 23385797. The reversal of 23385781 is 18758332.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 23367556 + 18225 = 4834^2 + 135^2 .
It is a cyclic number.
It is not a de Polignac number, because 23385781 - 217 = 23254709 is a prime.
It is a super-2 number, since 2×233857812 = 1093789505959922, which contains 22 as substring.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 23385781.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (23385731) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11692890 + 11692891.
It is an arithmetic number, because the mean of its divisors is an integer number (11692891).
Almost surely, 223385781 is an apocalyptic number.
It is an amenable number.
23385781 is a deficient number, since it is larger than the sum of its proper divisors (1).
23385781 is an equidigital number, since it uses as much as digits as its factorization.
23385781 is an evil number, because the sum of its binary digits is even.
The product of its digits is 40320, while the sum is 37.
The square root of 23385781 is about 4835.8847174018. The cubic root of 23385781 is about 285.9679043644.
The spelling of 23385781 in words is "twenty-three million, three hundred eighty-five thousand, seven hundred eighty-one".
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