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".