Base | Representation |
---|---|
bin | 1111101001000… |
… | …10000011001101 |
3 | 100010220020022001 |
4 | 13310202003031 |
5 | 232042231334 |
6 | 21004152301 |
7 | 3152164504 |
oct | 764420315 |
9 | 303806261 |
10 | 131211469 |
11 | 6807a134 |
12 | 37b38691 |
13 | 2125102c |
14 | 135d783b |
15 | b7bc714 |
hex | 7d220cd |
131211469 has 2 divisors, whose sum is σ = 131211470. Its totient is φ = 131211468.
The previous prime is 131211467. The next prime is 131211497. The reversal of 131211469 is 964112131.
It is an a-pointer prime, because the next prime (131211497) can be obtained adding 131211469 to its sum of digits (28).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 72505225 + 58706244 = 8515^2 + 7662^2 .
It is a cyclic number.
It is not a de Polignac number, because 131211469 - 21 = 131211467 is a prime.
It is a super-2 number, since 2×1312114692 = 34432899194275922, which contains 22 as substring.
Together with 131211467, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (131211467) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65605734 + 65605735.
It is an arithmetic number, because the mean of its divisors is an integer number (65605735).
Almost surely, 2131211469 is an apocalyptic number.
It is an amenable number.
131211469 is a deficient number, since it is larger than the sum of its proper divisors (1).
131211469 is an equidigital number, since it uses as much as digits as its factorization.
131211469 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1296, while the sum is 28.
The square root of 131211469 is about 11454.7574832469. The cubic root of 131211469 is about 508.1484430411.
It can be divided in two parts, 131 and 211469, that added together give a square (211600 = 4602).
The spelling of 131211469 in words is "one hundred thirty-one million, two hundred eleven thousand, four hundred sixty-nine".
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