85320521 has 16 divisors (see below), whose sum is σ = 101286528. Its totient is φ = 70848000.

The previous prime is 85320511. The next prime is 85320539. The reversal of 85320521 is 12502358.

It is a cyclic number.

It is not a de Polignac number, because 85320521 - 2¹⁰ = 85319497 is a prime.

It is a super-2 number, since 2×85320521² = 14559182607422882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85320511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10796 + ... + 16946.

It is an arithmetic number, because the mean of its divisors is an integer number (6330408).

Almost surely, 2^85320521 is an apocalyptic number.

It is an amenable number.

85320521 is a deficient number, since it is larger than the sum of its proper divisors (15966007).

85320521 is a wasteful number, since it uses less digits than its factorization.

85320521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 85320521 is about 9236.9107931169. The cubic root of 85320521 is about 440.2349313578.

Adding to 85320521 its reverse (12502358), we get a palindrome (97822879).

The spelling of 85320521 in words is "eighty-five million, three hundred twenty thousand, five hundred twenty-one".