85521309 has 8 divisors (see below), whose sum is σ = 114186912. Its totient is φ = 56934960.

The previous prime is 85521307. The next prime is 85521347. The reversal of 85521309 is 90312558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85521309 - 2¹ = 85521307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85521309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85521301) 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, 17247 + ... + 21644.

It is an arithmetic number, because the mean of its divisors is an integer number (14273364).

Almost surely, 2^85521309 is an apocalyptic number.

It is an amenable number.

85521309 is a deficient number, since it is larger than the sum of its proper divisors (28665603).

85521309 is a wasteful number, since it uses less digits than its factorization.

85521309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39627.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 85521309 is about 9247.7731914229. The cubic root of 85521309 is about 440.5800012998.

The spelling of 85521309 in words is "eighty-five million, five hundred twenty-one thousand, three hundred nine".