505280557 has 2 divisors, whose sum is σ = 505280558. Its totient is φ = 505280556.

The previous prime is 505280539. The next prime is 505280561. The reversal of 505280557 is 755082505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346369321 + 158911236 = 18611^2 + 12606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505280557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505280527) 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 as a sum of consecutive naturals, namely, 252640278 + 252640279.

It is an arithmetic number, because the mean of its divisors is an integer number (252640279).

Almost surely, 2^505280557 is an apocalyptic number.

It is an amenable number.

505280557 is a deficient number, since it is larger than the sum of its proper divisors (1).

505280557 is an equidigital number, since it uses as much as digits as its factorization.

505280557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70000, while the sum is 37.

The square root of 505280557 is about 22478.4464988130. The cubic root of 505280557 is about 796.4848675304.

The spelling of 505280557 in words is "five hundred five million, two hundred eighty thousand, five hundred fifty-seven".