81223080269 has 2 divisors, whose sum is σ = 81223080270. Its totient is φ = 81223080268.

The previous prime is 81223080167. The next prime is 81223080277. The reversal of 81223080269 is 96208032218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59031019369 + 22192060900 = 242963^2 + 148970^2 .

It is a cyclic number.

It is not a de Polignac number, because 81223080269 - 2³² = 76928112973 is a prime.

It is a super-2 number, since 2×81223080269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81223080769) 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, 40611540134 + 40611540135.

It is an arithmetic number, because the mean of its divisors is an integer number (40611540135).

Almost surely, 2^81223080269 is an apocalyptic number.

It is an amenable number.

81223080269 is a deficient number, since it is larger than the sum of its proper divisors (1).

81223080269 is an equidigital number, since it uses as much as digits as its factorization.

81223080269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 81223080269 in words is "eighty-one billion, two hundred twenty-three million, eighty thousand, two hundred sixty-nine".