3871494821 has 4 divisors (see below), whose sum is σ = 3877630944. Its totient is φ = 3865358700.

The previous prime is 3871494817. The next prime is 3871494833. The reversal of 3871494821 is 1284941783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3871494821 - 2² = 3871494817 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 (3871494811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3067115 + ... + 3068376.

It is an arithmetic number, because the mean of its divisors is an integer number (969407736).

Almost surely, 2^3871494821 is an apocalyptic number.

It is an amenable number.

3871494821 is a deficient number, since it is larger than the sum of its proper divisors (6136123).

3871494821 is an equidigital number, since it uses as much as digits as its factorization.

3871494821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6136122.

The product of its digits is 387072, while the sum is 47.

The square root of 3871494821 is about 62221.3373449977. The cubic root of 3871494821 is about 1570.2165875618.

The spelling of 3871494821 in words is "three billion, eight hundred seventy-one million, four hundred ninety-four thousand, eight hundred twenty-one".