505220557 has 2 divisors, whose sum is σ = 505220558. Its totient is φ = 505220556.

The previous prime is 505220489. The next prime is 505220699. The reversal of 505220557 is 755022505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346183236 + 159037321 = 18606^2 + 12611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505220557 is a prime.

It is a super-2 number, since 2×505220557² = 510495622430780498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505220357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252610278 + 252610279.

It is an arithmetic number, because the mean of its divisors is an integer number (252610279).

Almost surely, 2^505220557 is an apocalyptic number.

It is an amenable number.

505220557 is a deficient number, since it is larger than the sum of its proper divisors (1).

505220557 is an equidigital number, since it uses as much as digits as its factorization.

505220557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17500, while the sum is 31.

The square root of 505220557 is about 22477.1118473882. Note that the first 3 decimals coincide. The cubic root of 505220557 is about 796.4533398421.

The spelling of 505220557 in words is "five hundred five million, two hundred twenty thousand, five hundred fifty-seven".