505043345 has 4 divisors (see below), whose sum is σ = 606052020. Its totient is φ = 404034672.

The previous prime is 505043281. The next prime is 505043347. The reversal of 505043345 is 543340505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543340505 = 5 ⋅108668101.

It can be written as a sum of positive squares in 2 ways, for example, as 167365969 + 337677376 = 12937^2 + 18376^2 .

It is a cyclic number.

It is not a de Polignac number, because 505043345 - 2⁶ = 505043281 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505043347) 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, 50504330 + ... + 50504339.

It is an arithmetic number, because the mean of its divisors is an integer number (151513005).

Almost surely, 2^505043345 is an apocalyptic number.

It is an amenable number.

505043345 is a deficient number, since it is larger than the sum of its proper divisors (101008675).

505043345 is a wasteful number, since it uses less digits than its factorization.

505043345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101008674.

The product of its (nonzero) digits is 18000, while the sum is 29.

The square root of 505043345 is about 22473.1694471430. The cubic root of 505043345 is about 796.3602071876.

The spelling of 505043345 in words is "five hundred five million, forty-three thousand, three hundred forty-five".