Base | Representation |
---|---|
bin | 10100001011010000011 |
3 | 1020120220001 |
4 | 2201122003 |
5 | 132123443 |
6 | 22100431 |
7 | 5422321 |
oct | 2413203 |
9 | 1216801 |
10 | 661123 |
11 | 411791 |
12 | 27a717 |
13 | 1a1bc8 |
14 | 132d11 |
15 | d0d4d |
hex | a1683 |
661123 has 4 divisors (see below), whose sum is σ = 664240. Its totient is φ = 658008.
The previous prime is 661121. The next prime is 661139. The reversal of 661123 is 321166.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321166 = 2 ⋅160583.
It is a cyclic number.
It is not a de Polignac number, because 661123 - 21 = 661121 is a prime.
It is a super-2 number, since 2×6611232 = 874167242258, which contains 22 as substring.
It is a Duffinian number.
661123 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 661123.
It is not an unprimeable number, because it can be changed into a prime (661121) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215 + ... + 1672.
It is an arithmetic number, because the mean of its divisors is an integer number (166060).
2661123 is an apocalyptic number.
661123 is a deficient number, since it is larger than the sum of its proper divisors (3117).
661123 is a wasteful number, since it uses less digits than its factorization.
661123 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3116.
The product of its digits is 216, while the sum is 19.
The square root of 661123 is about 813.0947054310. The cubic root of 661123 is about 87.1152302334.
Adding to 661123 its reverse (321166), we get a palindrome (982289).
It can be divided in two parts, 661 and 123, that added together give a square (784 = 282).
The spelling of 661123 in words is "six hundred sixty-one thousand, one hundred twenty-three".
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