3866809091 has 4 divisors (see below), whose sum is σ = 3882854184. Its totient is φ = 3850764000.

The previous prime is 3866809081. The next prime is 3866809147. The reversal of 3866809091 is 1909086683.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3866809091 - 2¹⁸ = 3866546947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3866809081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8022185 + ... + 8022666.

It is an arithmetic number, because the mean of its divisors is an integer number (970713546).

Almost surely, 2^3866809091 is an apocalyptic number.

3866809091 is a deficient number, since it is larger than the sum of its proper divisors (16045093).

3866809091 is a wasteful number, since it uses less digits than its factorization.

3866809091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16045092.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 3866809091 is about 62183.6722218944. The cubic root of 3866809091 is about 1569.5828460182.

The spelling of 3866809091 in words is "three billion, eight hundred sixty-six million, eight hundred nine thousand, ninety-one".