Base | Representation |
---|---|
bin | 1001101101010… |
… | …01011000001001 |
3 | 12200020021121120 |
4 | 10312221120021 |
5 | 131321342441 |
6 | 12025225453 |
7 | 2006115156 |
oct | 466513011 |
9 | 180207546 |
10 | 81434121 |
11 | 41a7072a |
12 | 23332289 |
13 | 13b43092 |
14 | ab5b22d |
15 | 7238966 |
hex | 4da9609 |
81434121 has 4 divisors (see below), whose sum is σ = 108578832. Its totient is φ = 54289412.
The previous prime is 81434113. The next prime is 81434137. The reversal of 81434121 is 12143418.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 81434121 - 23 = 81434113 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 81434091 and 81434100.
It is not an unprimeable number, because it can be changed into a prime (81434161) 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, 13572351 + ... + 13572356.
It is an arithmetic number, because the mean of its divisors is an integer number (27144708).
Almost surely, 281434121 is an apocalyptic number.
It is an amenable number.
81434121 is a deficient number, since it is larger than the sum of its proper divisors (27144711).
81434121 is a wasteful number, since it uses less digits than its factorization.
81434121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 27144710.
The product of its digits is 768, while the sum is 24.
The square root of 81434121 is about 9024.0856046472. The cubic root of 81434121 is about 433.4464705904.
Adding to 81434121 its reverse (12143418), we get a palindrome (93577539).
The spelling of 81434121 in words is "eighty-one million, four hundred thirty-four thousand, one hundred twenty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.001 sec. • engine limits •