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BaseRepresentation
bin100110001000000100…
…1100111000010000011
321211100000212212121001
41030100021213002003
52320140041131001
6101340224312431
75625642564325
oct1142011470203
9254300785531
1081875333251
11317a5544778
1213a4ba72717
13794a81006a
143d69c61615
1521e2e58001
hex1310267083

81875333251 has 2 divisors, whose sum is σ = 81875333252. Its totient is φ = 81875333250.

The previous prime is 81875333219. The next prime is 81875333321. The reversal of 81875333251 is 15233357818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81875333251 - 25 = 81875333219 is a prime.

It is not a weakly prime, because it can be changed into another prime (81875334251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40937666625 + 40937666626.

It is an arithmetic number, because the mean of its divisors is an integer number (40937666626).

Almost surely, 281875333251 is an apocalyptic number.

81875333251 is a deficient number, since it is larger than the sum of its proper divisors (1).

81875333251 is an equidigital number, since it uses as much as digits as its factorization.

81875333251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The spelling of 81875333251 in words is "eighty-one billion, eight hundred seventy-five million, three hundred thirty-three thousand, two hundred fifty-one".