85016681 has 2 divisors, whose sum is σ = 85016682. Its totient is φ = 85016680.

The previous prime is 85016653. The next prime is 85016683. The reversal of 85016681 is 18661058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85008400 + 8281 = 9220^2 + 91^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85016681 is a prime.

It is a super-2 number, since 2×85016681² = 14455672096511522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 85016683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85016683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42508340 + 42508341.

It is an arithmetic number, because the mean of its divisors is an integer number (42508341).

Almost surely, 2^85016681 is an apocalyptic number.

It is an amenable number.

85016681 is a deficient number, since it is larger than the sum of its proper divisors (1).

85016681 is an equidigital number, since it uses as much as digits as its factorization.

85016681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 85016681 is about 9220.4490671550. The cubic root of 85016681 is about 439.7117274976.

The spelling of 85016681 in words is "eighty-five million, sixteen thousand, six hundred eighty-one".