3867141821 has 2 divisors, whose sum is σ = 3867141822. Its totient is φ = 3867141820.

The previous prime is 3867141749. The next prime is 3867141907. The reversal of 3867141821 is 1281417683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3817509796 + 49632025 = 61786^2 + 7045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3867141821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3867141721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933570910 + 1933570911.

It is an arithmetic number, because the mean of its divisors is an integer number (1933570911).

Almost surely, 2^3867141821 is an apocalyptic number.

It is an amenable number.

3867141821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867141821 is an equidigital number, since it uses as much as digits as its factorization.

3867141821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 3867141821 is about 62186.3475451003. The cubic root of 3867141821 is about 1569.6278643877.

The spelling of 3867141821 in words is "three billion, eight hundred sixty-seven million, one hundred forty-one thousand, eight hundred twenty-one".