820519009 has 8 divisors (see below), whose sum is σ = 863996000. Its totient is φ = 777071232.

The previous prime is 820519003. The next prime is 820519027. The reversal of 820519009 is 900915028.

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 820519009 - 2²³ = 812130401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820519003) 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, 73222 + ... + 83680.

It is an arithmetic number, because the mean of its divisors is an integer number (107999500).

Almost surely, 2^820519009 is an apocalyptic number.

It is an amenable number.

820519009 is a deficient number, since it is larger than the sum of its proper divisors (43476991).

820519009 is a wasteful number, since it uses less digits than its factorization.

820519009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14607.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 820519009 is about 28644.7029832742. The cubic root of 820519009 is about 936.1875951853.

The spelling of 820519009 in words is "eight hundred twenty million, five hundred nineteen thousand, nine".