845523809 has 8 divisors (see below), whose sum is σ = 911048040. Its totient is φ = 780068736.

The previous prime is 845523761. The next prime is 845523821. The reversal of 845523809 is 908325548.

845523809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 34869025 + 810654784 = 5905^2 + 28472^2 .

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 845523809 - 2²⁴ = 828746593 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 845523809.

It is not an unprimeable number, because it can be changed into a prime (845523829) 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, 9677 + ... + 42245.

It is an arithmetic number, because the mean of its divisors is an integer number (113881005).

Almost surely, 2^845523809 is an apocalyptic number.

It is an amenable number.

845523809 is a deficient number, since it is larger than the sum of its proper divisors (65524231).

845523809 is a wasteful number, since it uses less digits than its factorization.

845523809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34579.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 845523809 is about 29077.8921003569. The cubic root of 845523809 is about 945.6025044627.

The spelling of 845523809 in words is "eight hundred forty-five million, five hundred twenty-three thousand, eight hundred nine".