81163 has 2 divisors, whose sum is σ = 81164. Its totient is φ = 81162.

The previous prime is 81157. The next prime is 81173. The reversal of 81163 is 36118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81163 - 2⁵ = 81131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81163.

It is not a weakly prime, because it can be changed into another prime (81173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40581 + 40582.

It is an arithmetic number, because the mean of its divisors is an integer number (40582).

2⁸¹¹⁶³ is an apocalyptic number.

81163 is a deficient number, since it is larger than the sum of its proper divisors (1).

81163 is an equidigital number, since it uses as much as digits as its factorization.

81163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 81163 is about 284.8912073055. The cubic root of 81163 is about 43.2964907097.

It can be divided in two parts, 81 and 163, that multiplied together give a triangular number (13203 = T₁₆₂).

The spelling of 81163 in words is "eighty-one thousand, one hundred sixty-three".