555331681 has 2 divisors, whose sum is σ = 555331682. Its totient is φ = 555331680.

The previous prime is 555331561. The next prime is 555331691. The reversal of 555331681 is 186133555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544989025 + 10342656 = 23345^2 + 3216^2 .

It is a cyclic number.

It is not a de Polignac number, because 555331681 - 2⁹ = 555331169 is a prime.

It is a super-2 number, since 2×555331681² = 616786551844571522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 555331681.

It is not a weakly prime, because it can be changed into another prime (555331691) 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, 277665840 + 277665841.

It is an arithmetic number, because the mean of its divisors is an integer number (277665841).

Almost surely, 2^555331681 is an apocalyptic number.

It is an amenable number.

555331681 is a deficient number, since it is larger than the sum of its proper divisors (1).

555331681 is an equidigital number, since it uses as much as digits as its factorization.

555331681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The square root of 555331681 is about 23565.4764645233. The cubic root of 555331681 is about 821.9602521810.

The spelling of 555331681 in words is "five hundred fifty-five million, three hundred thirty-one thousand, six hundred eighty-one".