81926367317 has 2 divisors, whose sum is σ = 81926367318. Its totient is φ = 81926367316.

The previous prime is 81926367277. The next prime is 81926367319. The reversal of 81926367317 is 71376362918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73856758756 + 8069608561 = 271766^2 + 89831^2 .

It is a cyclic number.

It is not a de Polignac number, because 81926367317 - 2⁶ = 81926367253 is a prime.

Together with 81926367319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81926367319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40963183658 + 40963183659.

It is an arithmetic number, because the mean of its divisors is an integer number (40963183659).

Almost surely, 2^81926367317 is an apocalyptic number.

It is an amenable number.

81926367317 is a deficient number, since it is larger than the sum of its proper divisors (1).

81926367317 is an equidigital number, since it uses as much as digits as its factorization.

81926367317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 53.

The spelling of 81926367317 in words is "eighty-one billion, nine hundred twenty-six million, three hundred sixty-seven thousand, three hundred seventeen".