3866809081 has 2 divisors, whose sum is σ = 3866809082. Its totient is φ = 3866809080.

The previous prime is 3866809007. The next prime is 3866809147. The reversal of 3866809081 is 1809086683.

3866809081 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., 2281495225 + 1585313856 = 47765^2 + 39816^2 .

It is a cyclic number.

It is not a de Polignac number, because 3866809081 - 2¹⁷ = 3866678009 is a prime.

It is a super-2 number, since 2×3866809081² = 29904424937808129122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3866809981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933404540 + 1933404541.

It is an arithmetic number, because the mean of its divisors is an integer number (1933404541).

Almost surely, 2^3866809081 is an apocalyptic number.

It is an amenable number.

3866809081 is a deficient number, since it is larger than the sum of its proper divisors (1).

3866809081 is an equidigital number, since it uses as much as digits as its factorization.

3866809081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 3866809081 is about 62183.6721414874. The cubic root of 3866809081 is about 1569.5828446651.

The spelling of 3866809081 in words is "three billion, eight hundred sixty-six million, eight hundred nine thousand, eighty-one".