Base | Representation |
---|---|
bin | 110010011011… |
… | …110010100111 |
3 | 220212200211211 |
4 | 302123302213 |
5 | 11341033111 |
6 | 1151212251 |
7 | 220243165 |
oct | 62336247 |
9 | 26780754 |
10 | 13221031 |
11 | 751017a |
12 | 4517087 |
13 | 297b9c5 |
14 | 1a82235 |
15 | 1262521 |
hex | c9bca7 |
13221031 has 2 divisors, whose sum is σ = 13221032. Its totient is φ = 13221030.
The previous prime is 13221029. The next prime is 13221037. The reversal of 13221031 is 13012231.
It is a weak prime.
It is an emirp because it is prime and its reverse (13012231) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 13221031 - 21 = 13221029 is a prime.
It is a super-2 number, since 2×132210312 = 349591321405922, which contains 22 as substring.
Together with 13221029, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (13221037) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610515 + 6610516.
It is an arithmetic number, because the mean of its divisors is an integer number (6610516).
Almost surely, 213221031 is an apocalyptic number.
13221031 is a deficient number, since it is larger than the sum of its proper divisors (1).
13221031 is an equidigital number, since it uses as much as digits as its factorization.
13221031 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 36, while the sum is 13.
The square root of 13221031 is about 3636.0735691127. The cubic root of 13221031 is about 236.4585966881.
Adding to 13221031 its reverse (13012231), we get a palindrome (26233262).
The spelling of 13221031 in words is "thirteen million, two hundred twenty-one thousand, thirty-one".
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