545822809 has 12 divisors (see below), whose sum is σ = 636376500. Its totient is φ = 466787328.

The previous prime is 545822807. The next prime is 545822819. The reversal of 545822809 is 908228545.

It can be written as a sum of positive squares in 2 ways, for example, as 413227584 + 132595225 = 20328^2 + 11515^2 .

It is not a de Polignac number, because 545822809 - 2¹ = 545822807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545822807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9597 + ... + 34405.

It is an arithmetic number, because the mean of its divisors is an integer number (53031375).

Almost surely, 2^545822809 is an apocalyptic number.

It is an amenable number.

545822809 is a deficient number, since it is larger than the sum of its proper divisors (90553691).

545822809 is a wasteful number, since it uses less digits than its factorization.

545822809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25272 (or 25265 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 545822809 is about 23362.8510460517. The cubic root of 545822809 is about 817.2417781210.

The spelling of 545822809 in words is "five hundred forty-five million, eight hundred twenty-two thousand, eight hundred nine".