Base | Representation |
---|---|
bin | 1001101010100… |
… | …10011101000001 |
3 | 12122120012012220 |
4 | 10311102131001 |
5 | 131223444311 |
6 | 12013441253 |
7 | 2003103150 |
oct | 465223501 |
9 | 178505186 |
10 | 81078081 |
11 | 41848187 |
12 | 231a0229 |
13 | 13a49cc6 |
14 | aaa7597 |
15 | 71b8206 |
hex | 4d52741 |
81078081 has 16 divisors (see below), whose sum is σ = 123978624. Its totient is φ = 46168704.
The previous prime is 81078079. The next prime is 81078131. The reversal of 81078081 is 18087018.
It is not a de Polignac number, because 81078081 - 21 = 81078079 is a prime.
It is a super-2 number, since 2×810780812 = 13147310437285122, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (81078001) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436 + ... + 12741.
It is an arithmetic number, because the mean of its divisors is an integer number (7748664).
Almost surely, 281078081 is an apocalyptic number.
It is an amenable number.
81078081 is a deficient number, since it is larger than the sum of its proper divisors (42900543).
81078081 is a wasteful number, since it uses less digits than its factorization.
81078081 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 13480.
The product of its (nonzero) digits is 3584, while the sum is 33.
The square root of 81078081 is about 9004.3367884592. The cubic root of 81078081 is about 432.8138539606.
The spelling of 81078081 in words is "eighty-one million, seventy-eight thousand, eighty-one".
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