85035581 has 4 divisors (see below), whose sum is σ = 90037692. Its totient is φ = 80033472.

The previous prime is 85035541. The next prime is 85035589. The reversal of 85035581 is 18553058.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42902500 + 42133081 = 6550^2 + 6491^2 .

It is a cyclic number.

It is not a de Polignac number, because 85035581 - 2¹⁴ = 85019197 is a prime.

It is a super-2 number, since 2×85035581² = 14462100072015122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85035589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501030 + ... + 2501063.

It is an arithmetic number, because the mean of its divisors is an integer number (22509423).

Almost surely, 2^85035581 is an apocalyptic number.

It is an amenable number.

85035581 is a deficient number, since it is larger than the sum of its proper divisors (5002111).

85035581 is a wasteful number, since it uses less digits than its factorization.

85035581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002110.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 85035581 is about 9221.4739060521. The cubic root of 85035581 is about 439.7443090874.

The spelling of 85035581 in words is "eighty-five million, thirty-five thousand, five hundred eighty-one".