81349 has 2 divisors, whose sum is σ = 81350. Its totient is φ = 81348.

The previous prime is 81343. The next prime is 81353. The reversal of 81349 is 94318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44100 + 37249 = 210^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 81349 - 2¹¹ = 79301 is a prime.

81349 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40674 + 40675.

It is an arithmetic number, because the mean of its divisors is an integer number (40675).

2⁸¹³⁴⁹ is an apocalyptic number.

It is an amenable number.

81349 is a deficient number, since it is larger than the sum of its proper divisors (1).

81349 is an equidigital number, since it uses as much as digits as its factorization.

81349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 81349 is about 285.2174608961. The cubic root of 81349 is about 43.3295394443.

The spelling of 81349 in words is "eighty-one thousand, three hundred forty-nine".