81966341 has 2 divisors, whose sum is σ = 81966342. Its totient is φ = 81966340.

The previous prime is 81966331. The next prime is 81966413. The reversal of 81966341 is 14366918.

Together with next prime (81966413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42640900 + 39325441 = 6530^2 + 6271^2 .

It is a cyclic number.

It is not a de Polignac number, because 81966341 - 2⁶ = 81966277 is a prime.

It is a Chen prime.

It is equal to p_4777562 and since 81966341 and 4777562 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 81966295 and 81966304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81966301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40983170 + 40983171.

It is an arithmetic number, because the mean of its divisors is an integer number (40983171).

Almost surely, 2^81966341 is an apocalyptic number.

It is an amenable number.

81966341 is a deficient number, since it is larger than the sum of its proper divisors (1).

81966341 is an equidigital number, since it uses as much as digits as its factorization.

81966341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 81966341 is about 9053.5264400122. The cubic root of 81966341 is about 434.3886969854.

The spelling of 81966341 in words is "eighty-one million, nine hundred sixty-six thousand, three hundred forty-one".