3881631821 has 8 divisors (see below), whose sum is σ = 3909309888. Its totient is φ = 3853980000.

The previous prime is 3881631791. The next prime is 3881631839. The reversal of 3881631821 is 1281361883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3881631821 - 2⁶ = 3881631757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3881631881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363326 + ... + 373856.

It is an arithmetic number, because the mean of its divisors is an integer number (488663736).

Almost surely, 2^3881631821 is an apocalyptic number.

It is an amenable number.

3881631821 is a deficient number, since it is larger than the sum of its proper divisors (27678067).

3881631821 is a wasteful number, since it uses less digits than its factorization.

3881631821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13123.

The product of its digits is 55296, while the sum is 41.

The square root of 3881631821 is about 62302.7432863112. The cubic root of 3881631821 is about 1571.5858617067.

The spelling of 3881631821 in words is "three billion, eight hundred eighty-one million, six hundred thirty-one thousand, eight hundred twenty-one".