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128436901 is a prime number
BaseRepresentation
bin1111010011111…
…00101010100101
322221200021022021
413221330222211
5230334440101
620424503141
73116460415
oct751745245
9287607267
10128436901
11665545aa
123701aab1
13207bc188
14130b4645
15b4205a1
hex7a7caa5

128436901 has 2 divisors, whose sum is σ = 128436902. Its totient is φ = 128436900.

The previous prime is 128436883. The next prime is 128436949. The reversal of 128436901 is 109634821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120450625 + 7986276 = 10975^2 + 2826^2 .

It is a cyclic number.

It is not a de Polignac number, because 128436901 - 211 = 128434853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128436601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64218450 + 64218451.

It is an arithmetic number, because the mean of its divisors is an integer number (64218451).

Almost surely, 2128436901 is an apocalyptic number.

It is an amenable number.

128436901 is a deficient number, since it is larger than the sum of its proper divisors (1).

128436901 is an equidigital number, since it uses as much as digits as its factorization.

128436901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 128436901 is about 11333.0005294273. Note that the first 3 decimals coincide. The cubic root of 128436901 is about 504.5411654347.

The spelling of 128436901 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, nine hundred one".