3555445381 has 2 divisors, whose sum is σ = 3555445382. Its totient is φ = 3555445380.

The previous prime is 3555445379. The next prime is 3555445423. The reversal of 3555445381 is 1835445553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3118217281 + 437228100 = 55841^2 + 20910^2 .

It is a cyclic number.

It is not a de Polignac number, because 3555445381 - 2¹ = 3555445379 is a prime.

It is a super-2 number, since 2×3555445381² = 25282383714548470322, which contains 22 as substring.

Together with 3555445379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3555445981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1777722690 + 1777722691.

It is an arithmetic number, because the mean of its divisors is an integer number (1777722691).

Almost surely, 2^3555445381 is an apocalyptic number.

It is an amenable number.

3555445381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3555445381 is an equidigital number, since it uses as much as digits as its factorization.

3555445381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720000, while the sum is 43.

The square root of 3555445381 is about 59627.5555511041. Note that the first 5 decimals coincide. The cubic root of 3555445381 is about 1526.2698917771.

The spelling of 3555445381 in words is "three billion, five hundred fifty-five million, four hundred forty-five thousand, three hundred eighty-one".