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81701 is a prime number
BaseRepresentation
bin10011111100100101
311011001222
4103330211
510103301
61430125
7460124
oct237445
9134058
1081701
1156424
123b345
132b259
1421abb
151931b
hex13f25

81701 has 2 divisors, whose sum is σ = 81702. Its totient is φ = 81700.

The previous prime is 81689. The next prime is 81703. The reversal of 81701 is 10718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51076 + 30625 = 226^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 81701 - 26 = 81637 is a prime.

It is a Sophie Germain prime.

Together with 81703, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40850 + 40851.

It is an arithmetic number, because the mean of its divisors is an integer number (40851).

281701 is an apocalyptic number.

It is an amenable number.

81701 is a deficient number, since it is larger than the sum of its proper divisors (1).

81701 is an equidigital number, since it uses as much as digits as its factorization.

81701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 81701 is about 285.8338678323. The cubic root of 81701 is about 43.3919456692.

Adding to 81701 its sum of digits (17), we get a palindrome (81718).

The spelling of 81701 in words is "eighty-one thousand, seven hundred one".