85316581 has 4 divisors (see below), whose sum is σ = 97504672. Its totient is φ = 73128492.

The previous prime is 85316551. The next prime is 85316587. The reversal of 85316581 is 18561358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18561358 = 2 ⋅9280679.

It is a cyclic number.

It is not a de Polignac number, because 85316581 - 2¹¹ = 85314533 is a prime.

It is a super-2 number, since 2×85316581² = 14557837987059122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85316581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85316587) 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, 6094035 + ... + 6094048.

It is an arithmetic number, because the mean of its divisors is an integer number (24376168).

Almost surely, 2^85316581 is an apocalyptic number.

It is an amenable number.

85316581 is a deficient number, since it is larger than the sum of its proper divisors (12188091).

85316581 is a wasteful number, since it uses less digits than its factorization.

85316581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12188090.

The product of its digits is 28800, while the sum is 37.

The square root of 85316581 is about 9236.6975158874. The cubic root of 85316581 is about 440.2281547453.

The spelling of 85316581 in words is "eighty-five million, three hundred sixteen thousand, five hundred eighty-one".