Base | Representation |
---|---|
bin | 100010100011… |
… | …1010101011001 |
3 | 1021002111012012 |
4 | 1011013111121 |
5 | 14114233402 |
6 | 1444155305 |
7 | 310000043 |
oct | 105072531 |
9 | 37074165 |
10 | 18117977 |
11 | a255339 |
12 | 6098b35 |
13 | 39a48c7 |
14 | 2598a93 |
15 | 18cd452 |
hex | 1147559 |
18117977 has 2 divisors, whose sum is σ = 18117978. Its totient is φ = 18117976.
The previous prime is 18117973. The next prime is 18117991. The reversal of 18117977 is 77971181.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 15649936 + 2468041 = 3956^2 + 1571^2 .
It is an emirp because it is prime and its reverse (77971181) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18117977 - 22 = 18117973 is a prime.
It is a super-2 number, since 2×181179772 = 656522181145058, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (18117973) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9058988 + 9058989.
It is an arithmetic number, because the mean of its divisors is an integer number (9058989).
Almost surely, 218117977 is an apocalyptic number.
It is an amenable number.
18117977 is a deficient number, since it is larger than the sum of its proper divisors (1).
18117977 is an equidigital number, since it uses as much as digits as its factorization.
18117977 is an evil number, because the sum of its binary digits is even.
The product of its digits is 24696, while the sum is 41.
The square root of 18117977 is about 4256.5217020473. The cubic root of 18117977 is about 262.6454619335.
The spelling of 18117977 in words is "eighteen million, one hundred seventeen thousand, nine hundred seventy-seven".
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