820549911 has 8 divisors (see below), whose sum is σ = 1109476224. Its totient is φ = 539328440.

The previous prime is 820549883. The next prime is 820549913. The reversal of 820549911 is 119945028.

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 820549911 - 2⁹ = 820549399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820549911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820549913) 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, 1925961 + ... + 1926386.

It is an arithmetic number, because the mean of its divisors is an integer number (138684528).

Almost surely, 2^820549911 is an apocalyptic number.

820549911 is a deficient number, since it is larger than the sum of its proper divisors (288926313).

820549911 is a wasteful number, since it uses less digits than its factorization.

820549911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852421.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 820549911 is about 28645.2423798438. The cubic root of 820549911 is about 936.1993477897.

The spelling of 820549911 in words is "eight hundred twenty million, five hundred forty-nine thousand, nine hundred eleven".