3555841781 has 2 divisors, whose sum is σ = 3555841782. Its totient is φ = 3555841780.

The previous prime is 3555841759. The next prime is 3555841789. The reversal of 3555841781 is 1871485553.

3555841781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3019502500 + 536339281 = 54950^2 + 23159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3555841781 is a prime.

It is a super-2 number, since 2×3555841781² = 25288021543010503922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3555841789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1777920890 + 1777920891.

It is an arithmetic number, because the mean of its divisors is an integer number (1777920891).

Almost surely, 2^3555841781 is an apocalyptic number.

It is an amenable number.

3555841781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3555841781 is an equidigital number, since it uses as much as digits as its factorization.

3555841781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672000, while the sum is 47.

The square root of 3555841781 is about 59630.8794250093. The cubic root of 3555841781 is about 1526.3266114317.

The spelling of 3555841781 in words is "three billion, five hundred fifty-five million, eight hundred forty-one thousand, seven hundred eighty-one".