503945557 has 4 divisors (see below), whose sum is σ = 521323020. Its totient is φ = 486568096.

The previous prime is 503945551. The next prime is 503945573. The reversal of 503945557 is 755549305.

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 114041041 + 389904516 = 10679^2 + 19746^2 .

It is a cyclic number.

It is not a de Polignac number, because 503945557 - 2¹⁵ = 503912789 is a prime.

It is a super-2 number, since 2×503945557² = 507922248840080498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503945551) 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, 8688688 + ... + 8688745.

It is an arithmetic number, because the mean of its divisors is an integer number (130330755).

Almost surely, 2^503945557 is an apocalyptic number.

It is an amenable number.

503945557 is a deficient number, since it is larger than the sum of its proper divisors (17377463).

503945557 is a wasteful number, since it uses less digits than its factorization.

503945557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17377462.

The product of its (nonzero) digits is 472500, while the sum is 43.

The square root of 503945557 is about 22448.7317459138. The cubic root of 503945557 is about 795.7827855459.

The spelling of 503945557 in words is "five hundred three million, nine hundred forty-five thousand, five hundred fifty-seven".