85586681 has 2 divisors, whose sum is σ = 85586682. Its totient is φ = 85586680.

The previous prime is 85586663. The next prime is 85586707. The reversal of 85586681 is 18668558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 12313081 = 8560^2 + 3509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85586681 is a prime.

It is a super-2 number, since 2×85586681² = 14650159929191522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85586651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42793340 + 42793341.

It is an arithmetic number, because the mean of its divisors is an integer number (42793341).

Almost surely, 2^85586681 is an apocalyptic number.

It is an amenable number.

85586681 is a deficient number, since it is larger than the sum of its proper divisors (1).

85586681 is an equidigital number, since it uses as much as digits as its factorization.

85586681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 460800, while the sum is 47.

The square root of 85586681 is about 9251.3069887449. The cubic root of 85586681 is about 440.6922316538.

The spelling of 85586681 in words is "eighty-five million, five hundred eighty-six thousand, six hundred eighty-one".