85008521 has 8 divisors (see below), whose sum is σ = 92091720. Its totient is φ = 78467376.

The previous prime is 85008491. The next prime is 85008533. The reversal of 85008521 is 12580058.

It can be written as a sum of positive squares in 4 ways, for example, as 12145225 + 72863296 = 3485^2 + 8536^2 .

It is a de Polignac number, because none of the positive numbers 2^k-85008521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85008421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17150 + ... + 21543.

It is an arithmetic number, because the mean of its divisors is an integer number (11511465).

Almost surely, 2^85008521 is an apocalyptic number.

It is an amenable number.

85008521 is a deficient number, since it is larger than the sum of its proper divisors (7083199).

85008521 is an equidigital number, since it uses as much as digits as its factorization.

85008521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38732 (or 38706 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 85008521 is about 9220.0065618198. The cubic root of 85008521 is about 439.6976590330.

Adding to 85008521 its reverse (12580058), we get a palindrome (97588579).

The spelling of 85008521 in words is "eighty-five million, eight thousand, five hundred twenty-one".