Base | Representation |
---|---|
bin | 111010000010… |
… | …1100101001001 |
3 | 2010021002020212 |
4 | 1310011211021 |
5 | 30242302221 |
6 | 3004130505 |
7 | 516443516 |
oct | 164054511 |
9 | 63232225 |
10 | 30431561 |
11 | 161a5756 |
12 | a236a35 |
13 | 63c6554 |
14 | 408230d |
15 | 2a11b5b |
hex | 1d05949 |
30431561 has 4 divisors (see below), whose sum is σ = 30446724. Its totient is φ = 30416400.
The previous prime is 30431543. The next prime is 30431563. The reversal of 30431561 is 16513403.
It is a happy number.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 7812025 + 22619536 = 2795^2 + 4756^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-30431561 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (30431563) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4010 + ... + 8771.
It is an arithmetic number, because the mean of its divisors is an integer number (7611681).
Almost surely, 230431561 is an apocalyptic number.
It is an amenable number.
30431561 is a deficient number, since it is larger than the sum of its proper divisors (15163).
30431561 is a wasteful number, since it uses less digits than its factorization.
30431561 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15162.
The product of its (nonzero) digits is 1080, while the sum is 23.
The square root of 30431561 is about 5516.4808528626. The cubic root of 30431561 is about 312.2061185945.
Adding to 30431561 its reverse (16513403), we get a palindrome (46944964).
The spelling of 30431561 in words is "thirty million, four hundred thirty-one thousand, five hundred sixty-one".
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