3538855681 has 2 divisors, whose sum is σ = 3538855682. Its totient is φ = 3538855680.

The previous prime is 3538855651. The next prime is 3538855699. The reversal of 3538855681 is 1865588353.

3538855681 is digitally balanced in base 2, 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., 3499905600 + 38950081 = 59160^2 + 6241^2 .

It is a cyclic number.

It is not a de Polignac number, because 3538855681 - 2¹⁵ = 3538822913 is a prime.

It is a super-2 number, since 2×3538855681² = 25046999061891947522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3538855651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1769427840 + 1769427841.

It is an arithmetic number, because the mean of its divisors is an integer number (1769427841).

Almost surely, 2^3538855681 is an apocalyptic number.

It is an amenable number.

3538855681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3538855681 is an equidigital number, since it uses as much as digits as its factorization.

3538855681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 52.

The square root of 3538855681 is about 59488.2818797114. The cubic root of 3538855681 is about 1523.8923327664.

The spelling of 3538855681 in words is "three billion, five hundred thirty-eight million, eight hundred fifty-five thousand, six hundred eighty-one".