3538943981 has 2 divisors, whose sum is σ = 3538943982. Its totient is φ = 3538943980.

The previous prime is 3538943929. The next prime is 3538944053. The reversal of 3538943981 is 1893498353.

3538943981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2608144900 + 930799081 = 51070^2 + 30509^2 .

It is a cyclic number.

It is not a de Polignac number, because 3538943981 - 2⁶ = 3538943917 is a prime.

It is a super-2 number, since 2×3538943981² = 25048249001312256722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3538943081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1769471990 + 1769471991.

It is an arithmetic number, because the mean of its divisors is an integer number (1769471991).

Almost surely, 2^3538943981 is an apocalyptic number.

It is an amenable number.

3538943981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3538943981 is an equidigital number, since it uses as much as digits as its factorization.

3538943981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 53.

The square root of 3538943981 is about 59489.0240380526. The cubic root of 3538943981 is about 1523.9050071623.

The spelling of 3538943981 in words is "three billion, five hundred thirty-eight million, nine hundred forty-three thousand, nine hundred eighty-one".