85560921 has 16 divisors (see below), whose sum is σ = 129150720. Its totient is φ = 55963440.

The previous prime is 85560913. The next prime is 85560931. The reversal of 85560921 is 12906558.

It is a happy number.

85560921 is a `hidden beast` number, since 8 + 5 + 560 + 92 + 1 = 666.

It is not a de Polignac number, because 85560921 - 2³ = 85560913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85560931) 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, 28465 + ... + 31326.

It is an arithmetic number, because the mean of its divisors is an integer number (8071920).

Almost surely, 2^85560921 is an apocalyptic number.

It is an amenable number.

85560921 is a deficient number, since it is larger than the sum of its proper divisors (43589799).

85560921 is a wasteful number, since it uses less digits than its factorization.

85560921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59853 (or 59847 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 85560921 is about 9249.9146482549. The cubic root of 85560921 is about 440.6480138274.

It can be divided in two parts, 855 and 60921, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 85560921 in words is "eighty-five million, five hundred sixty thousand, nine hundred twenty-one".