557420681 has 2 divisors, whose sum is σ = 557420682. Its totient is φ = 557420680.

The previous prime is 557420671. The next prime is 557420711. The reversal of 557420681 is 186024755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323820025 + 233600656 = 17995^2 + 15284^2 .

It is a cyclic number.

It is not a de Polignac number, because 557420681 - 2¹⁰ = 557419657 is a prime.

It is a super-2 number, since 2×557420681² = 621435631213007522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (557420621) 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 as a sum of consecutive naturals, namely, 278710340 + 278710341.

It is an arithmetic number, because the mean of its divisors is an integer number (278710341).

Almost surely, 2^557420681 is an apocalyptic number.

It is an amenable number.

557420681 is a deficient number, since it is larger than the sum of its proper divisors (1).

557420681 is an equidigital number, since it uses as much as digits as its factorization.

557420681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 557420681 is about 23609.7581732639. The cubic root of 557420681 is about 822.9896228343.

The spelling of 557420681 in words is "five hundred fifty-seven million, four hundred twenty thousand, six hundred eighty-one".