85328521 has 4 divisors (see below), whose sum is σ = 85387392. Its totient is φ = 85269652.

The previous prime is 85328519. The next prime is 85328539. The reversal of 85328521 is 12582358.

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: 12582358 = 2 ⋅6291179.

It is a cyclic number.

It is not a de Polignac number, because 85328521 - 2¹ = 85328519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85328591) 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, 27205 + ... + 30178.

It is an arithmetic number, because the mean of its divisors is an integer number (21346848).

Almost surely, 2^85328521 is an apocalyptic number.

It is an amenable number.

85328521 is a deficient number, since it is larger than the sum of its proper divisors (58871).

85328521 is a wasteful number, since it uses less digits than its factorization.

85328521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58870.

The product of its digits is 19200, while the sum is 34.

The square root of 85328521 is about 9237.3438281792. The cubic root of 85328521 is about 440.2486903353.

It can be divided in two parts, 85328 and 521, that added together give a square (85849 = 293²).

The spelling of 85328521 in words is "eighty-five million, three hundred twenty-eight thousand, five hundred twenty-one".