Base | Representation |
---|---|
bin | 110100100100… |
… | …100010001011 |
3 | 221221011011021 |
4 | 310210202023 |
5 | 12011444011 |
6 | 1211213311 |
7 | 225065140 |
oct | 64444213 |
9 | 27834137 |
10 | 13781131 |
11 | 7862a71 |
12 | 4747237 |
13 | 2b16920 |
14 | 1b8a3c7 |
15 | 1323471 |
hex | d2488b |
13781131 has 16 divisors (see below), whose sum is σ = 17424064. Its totient is φ = 10606464.
The previous prime is 13781129. The next prime is 13781149. The reversal of 13781131 is 13118731.
It is a cyclic number.
It is not a de Polignac number, because 13781131 - 21 = 13781129 is a prime.
It is a super-2 number, since 2×137811312 = 379839143278322, which contains 22 as substring.
It is a deceptive number, since it divides R13781130.
It is a junction number, because it is equal to n+sod(n) for n = 13781096 and 13781105.
It is not an unprimeable number, because it can be changed into a prime (13781731) 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, 1321 + ... + 5413.
It is an arithmetic number, because the mean of its divisors is an integer number (1089004).
Almost surely, 213781131 is an apocalyptic number.
13781131 is a deficient number, since it is larger than the sum of its proper divisors (3642933).
13781131 is a wasteful number, since it uses less digits than its factorization.
13781131 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4150.
The product of its digits is 504, while the sum is 25.
The square root of 13781131 is about 3712.2945734411. The cubic root of 13781131 is about 239.7516586252.
Adding to 13781131 its reverse (13118731), we get a palindrome (26899862).
The spelling of 13781131 in words is "thirteen million, seven hundred eighty-one thousand, one hundred thirty-one".
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