85708681 has 2 divisors, whose sum is σ = 85708682. Its totient is φ = 85708680.

The previous prime is 85708673. The next prime is 85708709. The reversal of 85708681 is 18680758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 29593600 = 7491^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 85708681 - 2³ = 85708673 is a prime.

It is a super-2 number, since 2×85708681² = 14691955997519522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85708621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42854340 + 42854341.

It is an arithmetic number, because the mean of its divisors is an integer number (42854341).

Almost surely, 2^85708681 is an apocalyptic number.

It is an amenable number.

85708681 is a deficient number, since it is larger than the sum of its proper divisors (1).

85708681 is an equidigital number, since it uses as much as digits as its factorization.

85708681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 85708681 is about 9257.8983036108. The cubic root of 85708681 is about 440.9015279507.

The spelling of 85708681 in words is "eighty-five million, seven hundred eight thousand, six hundred eighty-one".