820239113 has 4 divisors (see below), whose sum is σ = 820364100. Its totient is φ = 820114128.

The previous prime is 820239109. The next prime is 820239149. The reversal of 820239113 is 311932028.

820239113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 543449344 + 276789769 = 23312^2 + 16637^2 .

It is a cyclic number.

It is not a de Polignac number, because 820239113 - 2² = 820239109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (820239163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52070 + ... + 65967.

It is an arithmetic number, because the mean of its divisors is an integer number (205091025).

Almost surely, 2^820239113 is an apocalyptic number.

It is an amenable number.

820239113 is a deficient number, since it is larger than the sum of its proper divisors (124987).

820239113 is a wasteful number, since it uses less digits than its factorization.

820239113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124986.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 820239113 is about 28639.8169163143. The cubic root of 820239113 is about 936.0811320966.

The spelling of 820239113 in words is "eight hundred twenty million, two hundred thirty-nine thousand, one hundred thirteen".