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557 is a prime number

557 has 2 divisors, whose sum is σ = 558. Its totient is φ = 556.

The previous prime is 547. The next prime is 563. The reversal of 557 is 755.

557 is nontrivially palindromic in base 15.

557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

557 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361 + 196 = 19^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 557 - 24 = 541 is a prime.

It is a Chen prime.

557 is an undulating number in base 15.

It is a plaindrome in base 9, base 10, base 11, base 13, base 14 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278 + 279.

It is an arithmetic number, because the mean of its divisors is an integer number (279).

It is an amenable number.

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

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

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

The product of its digits is 175, while the sum is 17.

The square root of 557 is about 23.6008474424. The cubic root of 557 is about 8.2278253613.

The spelling of 557 in words is "five hundred fifty-seven", and thus it is an aban number and an oban number.