3863721181 has 4 divisors (see below), whose sum is σ = 3864279132. Its totient is φ = 3863163232.

The previous prime is 3863721167. The next prime is 3863721229. The reversal of 3863721181 is 1811273683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1811273683 = 1049 ⋅1726667.

It can be written as a sum of positive squares in 2 ways, for example, as 2844515556 + 1019205625 = 53334^2 + 31925^2 .

It is a cyclic number.

It is not a de Polignac number, because 3863721181 - 2⁵ = 3863721149 is a prime.

It is a super-2 number, since 2×3863721181² = 29856682729016069522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3863725181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268456 + ... + 282481.

It is an arithmetic number, because the mean of its divisors is an integer number (966069783).

Almost surely, 2^3863721181 is an apocalyptic number.

It is an amenable number.

3863721181 is a deficient number, since it is larger than the sum of its proper divisors (557951).

3863721181 is an equidigital number, since it uses as much as digits as its factorization.

3863721181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557950.

The product of its digits is 48384, while the sum is 40.

The square root of 3863721181 is about 62158.8383176520. The cubic root of 3863721181 is about 1569.1649285421.

The spelling of 3863721181 in words is "three billion, eight hundred sixty-three million, seven hundred twenty-one thousand, one hundred eighty-one".