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128709029 is a prime number
BaseRepresentation
bin1111010101111…
…11000110100101
322222012002121002
413222333012211
5230422142104
620434403045
73122002661
oct752770645
9288162532
10128709029
116671aaa9
1237130485
1320885cb7
14131458a1
15b47601e
hex7abf1a5

128709029 has 2 divisors, whose sum is σ = 128709030. Its totient is φ = 128709028.

The previous prime is 128708999. The next prime is 128709067. The reversal of 128709029 is 920907821.

It is an a-pointer prime, because the next prime (128709067) can be obtained adding 128709029 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128709025 + 4 = 11345^2 + 2^2 .

It is an emirp because it is prime and its reverse (920907821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128709029 - 220 = 127660453 is a prime.

It is a super-2 number, since 2×1287090292 = 33132028292245682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128708983 and 128709001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128709089) 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 as a sum of consecutive naturals, namely, 64354514 + 64354515.

It is an arithmetic number, because the mean of its divisors is an integer number (64354515).

Almost surely, 2128709029 is an apocalyptic number.

It is an amenable number.

128709029 is a deficient number, since it is larger than the sum of its proper divisors (1).

128709029 is an equidigital number, since it uses as much as digits as its factorization.

128709029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 128709029 is about 11345.0001762891. Note that the first 3 decimals coincide. The cubic root of 128709029 is about 504.8972492973.

The spelling of 128709029 in words is "one hundred twenty-eight million, seven hundred nine thousand, twenty-nine".