823520011 has 4 divisors (see below), whose sum is σ = 823677400. Its totient is φ = 823362624.

The previous prime is 823519927. The next prime is 823520017. The reversal of 823520011 is 110025328.

823520011 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 is a cyclic number.

It is not a de Polignac number, because 823520011 - 2²¹ = 821422859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823520017) 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, 70566 + ... + 81403.

It is an arithmetic number, because the mean of its divisors is an integer number (205919350).

Almost surely, 2^823520011 is an apocalyptic number.

823520011 is a deficient number, since it is larger than the sum of its proper divisors (157389).

823520011 is a wasteful number, since it uses less digits than its factorization.

823520011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157388.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 823520011 is about 28697.0383663541. The cubic root of 823520011 is about 937.3275576402.

Adding to 823520011 its reverse (110025328), we get a palindrome (933545339).

The spelling of 823520011 in words is "eight hundred twenty-three million, five hundred twenty thousand, eleven".