85685921 has 8 divisors (see below), whose sum is σ = 87161184. Its totient is φ = 84223360.

The previous prime is 85685893. The next prime is 85685939. The reversal of 85685921 is 12958658.

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

It is a cyclic number.

It is not a de Polignac number, because 85685921 - 2⁶ = 85685857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85685521) 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, 10961 + ... + 17073.

It is an arithmetic number, because the mean of its divisors is an integer number (10895148).

Almost surely, 2^85685921 is an apocalyptic number.

It is an amenable number.

85685921 is a deficient number, since it is larger than the sum of its proper divisors (1475263).

85685921 is a wasteful number, since it uses less digits than its factorization.

85685921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351.

The product of its digits is 172800, while the sum is 44.

The square root of 85685921 is about 9256.6690013201. The cubic root of 85685921 is about 440.8624972596.

The spelling of 85685921 in words is "eighty-five million, six hundred eighty-five thousand, nine hundred twenty-one".