Base | Representation |
---|---|
bin | 1111010011000… |
… | …01001101001111 |
3 | 22221110120000201 |
4 | 13221201031033 |
5 | 230322340211 |
6 | 20422234331 |
7 | 3115511464 |
oct | 751411517 |
9 | 287416021 |
10 | 128324431 |
11 | 66488054 |
12 | 36b859a7 |
13 | 2077cc21 |
14 | 1308566b |
15 | b3ec0c1 |
hex | 7a6134f |
128324431 has 2 divisors, whose sum is σ = 128324432. Its totient is φ = 128324430.
The previous prime is 128324401. The next prime is 128324459. The reversal of 128324431 is 134423821.
It is an a-pointer prime, because the next prime (128324459) can be obtained adding 128324431 to its sum of digits (28).
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 128324431 - 213 = 128316239 is a prime.
It is a super-2 number, since 2×1283244312 = 32934319182947522, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 128324431.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (128324401) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64162215 + 64162216.
It is an arithmetic number, because the mean of its divisors is an integer number (64162216).
Almost surely, 2128324431 is an apocalyptic number.
128324431 is a deficient number, since it is larger than the sum of its proper divisors (1).
128324431 is an equidigital number, since it uses as much as digits as its factorization.
128324431 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 4608, while the sum is 28.
The square root of 128324431 is about 11328.0373851784. The cubic root of 128324431 is about 504.3938497327.
The spelling of 128324431 in words is "one hundred twenty-eight million, three hundred twenty-four thousand, four hundred thirty-one".
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