85011681 has 32 divisors (see below), whose sum is σ = 123776640. Its totient is φ = 51715584.

The previous prime is 85011649. The next prime is 85011683. The reversal of 85011681 is 18611058.

It is a happy number.

It is not a de Polignac number, because 85011681 - 2⁵ = 85011649 is a prime.

It is a super-2 number, since 2×85011681² = 14453971812891522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85011683) 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 in 31 ways as a sum of consecutive naturals, for example, 364741 + ... + 364973.

It is an arithmetic number, because the mean of its divisors is an integer number (3868020).

Almost surely, 2^85011681 is an apocalyptic number.

It is an amenable number.

85011681 is a deficient number, since it is larger than the sum of its proper divisors (38764959).

85011681 is a wasteful number, since it uses less digits than its factorization.

85011681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 85011681 is about 9220.1779266997. The cubic root of 85011681 is about 439.7031072217.

The spelling of 85011681 in words is "eighty-five million, eleven thousand, six hundred eighty-one".