81707 has 2 divisors, whose sum is σ = 81708. Its totient is φ = 81706.

The previous prime is 81703. The next prime is 81727. The reversal of 81707 is 70718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81707 - 2² = 81703 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81701) 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, 40853 + 40854.

It is an arithmetic number, because the mean of its divisors is an integer number (40854).

2⁸¹⁷⁰⁷ is an apocalyptic number.

81707 is a deficient number, since it is larger than the sum of its proper divisors (1).

81707 is an equidigital number, since it uses as much as digits as its factorization.

81707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 81707 is about 285.8443632469. The cubic root of 81707 is about 43.3930078566.

The spelling of 81707 in words is "eighty-one thousand, seven hundred seven".