Base | Representation |
---|---|
bin | 1001100110010… |
… | …01111011111101 |
3 | 12121111210011211 |
4 | 10303021323331 |
5 | 131103101114 |
6 | 11553444421 |
7 | 1665254002 |
oct | 463117375 |
9 | 177453154 |
10 | 80518909 |
11 | 414a6059 |
12 | 22b70711 |
13 | 138b2633 |
14 | a99d8a9 |
15 | 71076c4 |
hex | 4cc9efd |
80518909 has 2 divisors, whose sum is σ = 80518910. Its totient is φ = 80518908.
The previous prime is 80518897. The next prime is 80518931. The reversal of 80518909 is 90981508.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 61622500 + 18896409 = 7850^2 + 4347^2 .
It is a cyclic number.
It is not a de Polignac number, because 80518909 - 211 = 80516861 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (80518969) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40259454 + 40259455.
It is an arithmetic number, because the mean of its divisors is an integer number (40259455).
Almost surely, 280518909 is an apocalyptic number.
It is an amenable number.
80518909 is a deficient number, since it is larger than the sum of its proper divisors (1).
80518909 is an equidigital number, since it uses as much as digits as its factorization.
80518909 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 25920, while the sum is 40.
The square root of 80518909 is about 8973.2329179622. The cubic root of 80518909 is about 431.8165605634.
The spelling of 80518909 in words is "eighty million, five hundred eighteen thousand, nine hundred nine".
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