Base | Representation |
---|---|
bin | 1001101101101… |
… | …10011101010001 |
3 | 12200100000002212 |
4 | 10312312131101 |
5 | 131330101242 |
6 | 12030321505 |
7 | 2006430314 |
oct | 466663521 |
9 | 180300085 |
10 | 81487697 |
11 | 41aa7a05 |
12 | 23359295 |
13 | 13b61595 |
14 | ab7297b |
15 | 7249782 |
hex | 4db6751 |
81487697 has 2 divisors, whose sum is σ = 81487698. Its totient is φ = 81487696.
The previous prime is 81487691. The next prime is 81487711. The reversal of 81487697 is 79678418.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 42562576 + 38925121 = 6524^2 + 6239^2 .
It is a cyclic number.
It is not a de Polignac number, because 81487697 - 218 = 81225553 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (81487691) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40743848 + 40743849.
It is an arithmetic number, because the mean of its divisors is an integer number (40743849).
Almost surely, 281487697 is an apocalyptic number.
It is an amenable number.
81487697 is a deficient number, since it is larger than the sum of its proper divisors (1).
81487697 is an equidigital number, since it uses as much as digits as its factorization.
81487697 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 677376, while the sum is 50.
The square root of 81487697 is about 9027.0536167678. The cubic root of 81487697 is about 433.5415054356.
The spelling of 81487697 in words is "eighty-one million, four hundred eighty-seven thousand, six hundred ninety-seven".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.067 sec. • engine limits •