820048861 has 4 divisors (see below), whose sum is σ = 820324224. Its totient is φ = 819773500.

The previous prime is 820048849. The next prime is 820048967. The reversal of 820048861 is 168840028.

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.

It is a cyclic number.

It is not a de Polignac number, because 820048861 - 2²³ = 811660253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820048861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820048811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133165 + ... + 139186.

It is an arithmetic number, because the mean of its divisors is an integer number (205081056).

Almost surely, 2^820048861 is an apocalyptic number.

It is an amenable number.

820048861 is a deficient number, since it is larger than the sum of its proper divisors (275363).

820048861 is a wasteful number, since it uses less digits than its factorization.

820048861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275362.

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 820048861 is about 28636.4952639111. The cubic root of 820048861 is about 936.0087527641.

Adding to 820048861 its reverse (168840028), we get a palindrome (988888889).

The spelling of 820048861 in words is "eight hundred twenty million, forty-eight thousand, eight hundred sixty-one".