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81799 is a prime number
BaseRepresentation
bin10011111110000111
311011012121
4103332013
510104144
61430411
7460324
oct237607
9134177
1081799
1156503
123b407
132b303
1421b4b
1519384
hex13f87

81799 has 2 divisors, whose sum is σ = 81800. Its totient is φ = 81798.

The previous prime is 81773. The next prime is 81817. The reversal of 81799 is 99718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81799 - 27 = 81671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40899 + 40900.

It is an arithmetic number, because the mean of its divisors is an integer number (40900).

281799 is an apocalyptic number.

81799 is a deficient number, since it is larger than the sum of its proper divisors (1).

81799 is an equidigital number, since it uses as much as digits as its factorization.

81799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 81799 is about 286.0052447072. The cubic root of 81799 is about 43.4092882214.

The spelling of 81799 in words is "eighty-one thousand, seven hundred ninety-nine".