Base | Representation |
---|---|
bin | 11101111100111… |
… | …01101010000110 |
3 | 122111210002122200 |
4 | 32332131222012 |
5 | 1003310133210 |
6 | 40533135330 |
7 | 6140431056 |
oct | 1676355206 |
9 | 574702580 |
10 | 251255430 |
11 | 119910a18 |
12 | 7018a546 |
13 | 40091c6a |
14 | 25525566 |
15 | 170d10c0 |
hex | ef9da86 |
251255430 has 48 divisors (see below), whose sum is σ = 687651120. Its totient is φ = 63474624.
The previous prime is 251255399. The next prime is 251255437. The reversal of 251255430 is 34552152.
It is a happy number.
It is a super-2 number, since 2×2512554302 = 126258582208969800, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 251255394 and 251255403.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (251255437) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71757 + ... + 75176.
It is an arithmetic number, because the mean of its divisors is an integer number (14326065).
Almost surely, 2251255430 is an apocalyptic number.
251255430 is an abundant number, since it is smaller than the sum of its proper divisors (436395690).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
251255430 is a wasteful number, since it uses less digits than its factorization.
251255430 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 146965 (or 146962 counting only the distinct ones).
The product of its (nonzero) digits is 6000, while the sum is 27.
The square root of 251255430 is about 15851.0387672228. The cubic root of 251255430 is about 631.0132598515.
The spelling of 251255430 in words is "two hundred fifty-one million, two hundred fifty-five thousand, four hundred thirty".
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