505345123 has 4 divisors (see below), whose sum is σ = 505402920. Its totient is φ = 505287328.

The previous prime is 505345091. The next prime is 505345133. The reversal of 505345123 is 321543505.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 505345123 - 2⁵ = 505345091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505345091 and 505345100.

It is not an unprimeable number, because it can be changed into a prime (505345133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12790 + ... + 34267.

It is an arithmetic number, because the mean of its divisors is an integer number (126350730).

Almost surely, 2^505345123 is an apocalyptic number.

505345123 is a deficient number, since it is larger than the sum of its proper divisors (57797).

505345123 is a wasteful number, since it uses less digits than its factorization.

505345123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57796.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 505345123 is about 22479.8826286972. The cubic root of 505345123 is about 796.5187916880.

Adding to 505345123 its reverse (321543505), we get a palindrome (826888628).

It can be divided in two parts, 5053 and 45123, that added together give a square (50176 = 224²).

The spelling of 505345123 in words is "five hundred five million, three hundred forty-five thousand, one hundred twenty-three".