505020557 has 4 divisors (see below), whose sum is σ = 508365216. Its totient is φ = 501675900.

The previous prime is 505020539. The next prime is 505020563. The reversal of 505020557 is 755020505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755020505 = 5 ⋅151004101.

It is a cyclic number.

It is not a de Polignac number, because 505020557 - 2¹² = 505016461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505020157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1672103 + ... + 1672404.

It is an arithmetic number, because the mean of its divisors is an integer number (127091304).

Almost surely, 2^505020557 is an apocalyptic number.

It is an amenable number.

505020557 is a deficient number, since it is larger than the sum of its proper divisors (3344659).

505020557 is a wasteful number, since it uses less digits than its factorization.

505020557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344658.

The product of its (nonzero) digits is 8750, while the sum is 29.

The square root of 505020557 is about 22472.6624368365. The cubic root of 505020557 is about 796.3482295164.

The spelling of 505020557 in words is "five hundred five million, twenty thousand, five hundred fifty-seven".