81049 has 2 divisors, whose sum is σ = 81050. Its totient is φ = 81048.

The previous prime is 81047. The next prime is 81071. The reversal of 81049 is 94018.

It is an a-pointer prime, because the next prime (81071) can be obtained adding 81049 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53824 + 27225 = 232^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 81049 - 2¹ = 81047 is a prime.

Together with 81047, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40524 + 40525.

It is an arithmetic number, because the mean of its divisors is an integer number (40525).

2⁸¹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

81049 is a deficient number, since it is larger than the sum of its proper divisors (1).

81049 is an equidigital number, since it uses as much as digits as its factorization.

81049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 81049 is about 284.6910606254. The cubic root of 81049 is about 43.2762100701.

The spelling of 81049 in words is "eighty-one thousand, forty-nine".