81224733319 has 2 divisors, whose sum is σ = 81224733320. Its totient is φ = 81224733318.

The previous prime is 81224733287. The next prime is 81224733323. The reversal of 81224733319 is 91333742218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81224733319 - 2⁵ = 81224733287 is a prime.

It is a super-2 number, since 2×81224733319² (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 (81224733349) 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, 40612366659 + 40612366660.

It is an arithmetic number, because the mean of its divisors is an integer number (40612366660).

Almost surely, 2^81224733319 is an apocalyptic number.

81224733319 is a deficient number, since it is larger than the sum of its proper divisors (1).

81224733319 is an equidigital number, since it uses as much as digits as its factorization.

81224733319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The spelling of 81224733319 in words is "eighty-one billion, two hundred twenty-four million, seven hundred thirty-three thousand, three hundred nineteen".