81359 has 2 divisors, whose sum is σ = 81360. Its totient is φ = 81358.

The previous prime is 81353. The next prime is 81371. The reversal of 81359 is 95318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81359 - 2⁴ = 81343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40679 + 40680.

It is an arithmetic number, because the mean of its divisors is an integer number (40680).

2⁸¹³⁵⁹ is an apocalyptic number.

81359 is a deficient number, since it is larger than the sum of its proper divisors (1).

81359 is an equidigital number, since it uses as much as digits as its factorization.

81359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 81359 is about 285.2349908409. The cubic root of 81359 is about 43.3313148304.

The spelling of 81359 in words is "eighty-one thousand, three hundred fifty-nine".