Base | Representation |
---|---|
bin | 111011001111… |
… | …0000001110101 |
3 | 2011102210210211 |
4 | 1312132001311 |
5 | 30422242424 |
6 | 3025345421 |
7 | 524654146 |
oct | 166360165 |
9 | 64383724 |
10 | 31055989 |
11 | 16591908 |
12 | a498271 |
13 | 6584833 |
14 | 41a5acd |
15 | 2ad6b94 |
hex | 1d9e075 |
31055989 has 2 divisors, whose sum is σ = 31055990. Its totient is φ = 31055988.
The previous prime is 31055977. The next prime is 31056029. The reversal of 31055989 is 98955013.
It is an a-pointer prime, because the next prime (31056029) can be obtained adding 31055989 to its sum of digits (40).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 30713764 + 342225 = 5542^2 + 585^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-31055989 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (31055909) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15527994 + 15527995.
It is an arithmetic number, because the mean of its divisors is an integer number (15527995).
Almost surely, 231055989 is an apocalyptic number.
It is an amenable number.
31055989 is a deficient number, since it is larger than the sum of its proper divisors (1).
31055989 is an equidigital number, since it uses as much as digits as its factorization.
31055989 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 48600, while the sum is 40.
The square root of 31055989 is about 5572.7900552596. The cubic root of 31055989 is about 314.3270727449.
The spelling of 31055989 in words is "thirty-one million, fifty-five thousand, nine hundred eighty-nine".
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