505404505 has 16 divisors (see below), whose sum is σ = 614871504. Its totient is φ = 398764800.

The previous prime is 505404491. The next prime is 505404569.

505404505 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 55413136 + 449991369 = 7444^2 + 21213^2 .

It is not a de Polignac number, because 505404505 - 2¹³ = 505396313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138079 + ... + 141691.

It is an arithmetic number, because the mean of its divisors is an integer number (38429469).

Almost surely, 2^505404505 is an apocalyptic number.

It is an amenable number.

505404505 is a deficient number, since it is larger than the sum of its proper divisors (109466999).

505404505 is a wasteful number, since it uses less digits than its factorization.

505404505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 505404505 is about 22481.2033708163. The cubic root of 505404505 is about 796.5499895263.

Adding to 505404505 its product of nonzero digits (10000), we get a palindrome (505414505).

The spelling of 505404505 in words is "five hundred five million, four hundred four thousand, five hundred five".