81834287 has 2 divisors, whose sum is σ = 81834288. Its totient is φ = 81834286.

The previous prime is 81834281. The next prime is 81834301. The reversal of 81834287 is 78243818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81834287 - 2⁴ = 81834271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81834281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40917143 + 40917144.

It is an arithmetic number, because the mean of its divisors is an integer number (40917144).

Almost surely, 2^81834287 is an apocalyptic number.

81834287 is a deficient number, since it is larger than the sum of its proper divisors (1).

81834287 is an equidigital number, since it uses as much as digits as its factorization.

81834287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 41.

The square root of 81834287 is about 9046.2305409491. The cubic root of 81834287 is about 434.1552938708.

The spelling of 81834287 in words is "eighty-one million, eight hundred thirty-four thousand, two hundred eighty-seven".