81143828959 has 2 divisors, whose sum is σ = 81143828960. Its totient is φ = 81143828958.

The previous prime is 81143828957. The next prime is 81143828989. The reversal of 81143828959 is 95982834118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81143828959 - 2¹ = 81143828957 is a prime.

Together with 81143828957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81143828957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40571914479 + 40571914480.

It is an arithmetic number, because the mean of its divisors is an integer number (40571914480).

Almost surely, 2^81143828959 is an apocalyptic number.

81143828959 is a deficient number, since it is larger than the sum of its proper divisors (1).

81143828959 is an equidigital number, since it uses as much as digits as its factorization.

81143828959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 58.

The spelling of 81143828959 in words is "eighty-one billion, one hundred forty-three million, eight hundred twenty-eight thousand, nine hundred fifty-nine".