Base | Representation |
---|---|
bin | 1110010101000… |
… | …11000101011101 |
3 | 22101012002011112 |
4 | 13022203011131 |
5 | 221233040121 |
6 | 15532231405 |
7 | 2656505552 |
oct | 712430535 |
9 | 271162145 |
10 | 120205661 |
11 | 61942324 |
12 | 3430b565 |
13 | 1bb99714 |
14 | 11d70a29 |
15 | a84675b |
hex | 72a315d |
120205661 has 2 divisors, whose sum is σ = 120205662. Its totient is φ = 120205660.
The previous prime is 120205639. The next prime is 120205681. The reversal of 120205661 is 166502021.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 62900761 + 57304900 = 7931^2 + 7570^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-120205661 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (120205621) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60102830 + 60102831.
It is an arithmetic number, because the mean of its divisors is an integer number (60102831).
Almost surely, 2120205661 is an apocalyptic number.
It is an amenable number.
120205661 is a deficient number, since it is larger than the sum of its proper divisors (1).
120205661 is an equidigital number, since it uses as much as digits as its factorization.
120205661 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 720, while the sum is 23.
The square root of 120205661 is about 10963.8342289548. The cubic root of 120205661 is about 493.5240338447.
Adding to 120205661 its reverse (166502021), we get a palindrome (286707682).
The spelling of 120205661 in words is "one hundred twenty million, two hundred five thousand, six hundred sixty-one".
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