555987281 has 2 divisors, whose sum is σ = 555987282. Its totient is φ = 555987280.

The previous prime is 555987247. The next prime is 555987283. The reversal of 555987281 is 182789555.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 545689600 + 10297681 = 23360^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 555987281 - 2¹⁰ = 555986257 is a prime.

It is a super-2 number, since 2×555987281² = 618243713267545922, which contains 22 as substring.

Together with 555987283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (555987283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277993640 + 277993641.

It is an arithmetic number, because the mean of its divisors is an integer number (277993641).

Almost surely, 2^555987281 is an apocalyptic number.

It is an amenable number.

555987281 is a deficient number, since it is larger than the sum of its proper divisors (1).

555987281 is an equidigital number, since it uses as much as digits as its factorization.

555987281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 50.

The square root of 555987281 is about 23579.3825406858. The cubic root of 555987281 is about 822.2835816077.

The spelling of 555987281 in words is "five hundred fifty-five million, nine hundred eighty-seven thousand, two hundred eighty-one".