Base | Representation |
---|---|
bin | 100001011111000… |
… | …000100111100001 |
3 | 1110011002020100001 |
4 | 201133000213201 |
5 | 2122303331441 |
6 | 131424500001 |
7 | 16631012113 |
oct | 4137004741 |
9 | 1404066301 |
10 | 561777121 |
11 | 269121514 |
12 | 13817a601 |
13 | 8c504bc9 |
14 | 548773b3 |
15 | 344bc731 |
hex | 217c09e1 |
561777121 has 32 divisors (see below), whose sum is σ = 631272096. Its totient is φ = 497664000.
The previous prime is 561777113. The next prime is 561777143. The reversal of 561777121 is 121777165.
It can be written as a sum of positive squares in 16 ways, for example, as 461777121 + 100000000 = 21489^2 + 10000^2 .
It is a 3-Lehmer number, since φ(561777121) divides (561777121-1)3.
It is a cyclic number.
It is a Carmichael number.
It is not a de Polignac number, because 561777121 - 23 = 561777113 is a prime.
It is a deceptive number, since it divides R561777120.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (561777221) 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 31 ways as a sum of consecutive naturals, for example, 3103651 + ... + 3103831.
It is an arithmetic number, because the mean of its divisors is an integer number (19727253).
It is a Poulet number, since it divides 2561777120-1.
Almost surely, 2561777121 is an apocalyptic number.
It is an amenable number.
561777121 is a deficient number, since it is larger than the sum of its proper divisors (69494975).
561777121 is a wasteful number, since it uses less digits than its factorization.
561777121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 373.
The product of its digits is 20580, while the sum is 37.
The square root of 561777121 is about 23701.8379245155. The cubic root of 561777121 is about 825.1280467305.
The spelling of 561777121 in words is "five hundred sixty-one million, seven hundred seventy-seven thousand, one hundred twenty-one".
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