517920545 has 4 divisors (see below), whose sum is σ = 621504660. Its totient is φ = 414336432.

The previous prime is 517920527. The next prime is 517920551. The reversal of 517920545 is 545029715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 294328336 + 223592209 = 17156^2 + 14953^2 .

It is a cyclic number.

It is not a de Polignac number, because 517920545 - 2²⁶ = 450811681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 517920499 and 517920508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51792050 + ... + 51792059.

It is an arithmetic number, because the mean of its divisors is an integer number (155376165).

Almost surely, 2^517920545 is an apocalyptic number.

It is an amenable number.

517920545 is a deficient number, since it is larger than the sum of its proper divisors (103584115).

517920545 is a wasteful number, since it uses less digits than its factorization.

517920545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103584114.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 517920545 is about 22757.8677604032. The cubic root of 517920545 is about 803.0718070923.

The spelling of 517920545 in words is "five hundred seventeen million, nine hundred twenty thousand, five hundred forty-five".