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BaseRepresentation
bin10011110011001001
311010020121
4103303021
510043342
61423241
7455302
oct236311
9133217
1081097
1155a25
123ab21
132abb3
14217a9
1519067
hex13cc9

81097 has 2 divisors, whose sum is σ = 81098. Its totient is φ = 81096.

The previous prime is 81083. The next prime is 81101. The reversal of 81097 is 79018.

81097 is nontrivially palindromic in base 6.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80656 + 441 = 284^2 + 21^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-81097 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (81017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40548 + 40549.

It is an arithmetic number, because the mean of its divisors is an integer number (40549).

281097 is an apocalyptic number.

It is an amenable number.

81097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81097 is an equidigital number, since it uses as much as digits as its factorization.

81097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 81097 is about 284.7753500568. The cubic root of 81097 is about 43.2847516032.

The spelling of 81097 in words is "eighty-one thousand, ninety-seven".