81299052841 has 2 divisors, whose sum is σ = 81299052842. Its totient is φ = 81299052840.

The previous prime is 81299052803. The next prime is 81299052871. The reversal of 81299052841 is 14825099218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47184962841 + 34114090000 = 217221^2 + 184700^2 .

It is a cyclic number.

It is not a de Polignac number, because 81299052841 - 2³⁵ = 46939314473 is a prime.

It is not a weakly prime, because it can be changed into another prime (81299052871) 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, 40649526420 + 40649526421.

It is an arithmetic number, because the mean of its divisors is an integer number (40649526421).

Almost surely, 2^81299052841 is an apocalyptic number.

It is an amenable number.

81299052841 is a deficient number, since it is larger than the sum of its proper divisors (1).

81299052841 is an equidigital number, since it uses as much as digits as its factorization.

81299052841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 81299052841 in words is "eighty-one billion, two hundred ninety-nine million, fifty-two thousand, eight hundred forty-one".