85821801 has 16 divisors (see below), whose sum is σ = 123978624. Its totient is φ = 52493184.

The previous prime is 85821781. The next prime is 85821829. The reversal of 85821801 is 10812858.

It is not a de Polignac number, because 85821801 - 2⁹ = 85821289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85821881) 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, 76 + ... + 13101.

It is an arithmetic number, because the mean of its divisors is an integer number (7748664).

Almost surely, 2^85821801 is an apocalyptic number.

It is an amenable number.

85821801 is a deficient number, since it is larger than the sum of its proper divisors (38156823).

85821801 is a wasteful number, since it uses less digits than its factorization.

85821801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13360.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 85821801 is about 9264.0056670967. The cubic root of 85821801 is about 441.0954128425.

The spelling of 85821801 in words is "eighty-five million, eight hundred twenty-one thousand, eight hundred one".