3991684361 has 8 divisors (see below), whose sum is σ = 4585810944. Its totient is φ = 3403529280.

The previous prime is 3991684349. The next prime is 3991684373. The reversal of 3991684361 is 1634861993.

3991684361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3991684349) and next prime (3991684373).

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 3991684361 - 2⁶ = 3991684297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991684321) 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, 1491440 + ... + 1494113.

It is an arithmetic number, because the mean of its divisors is an integer number (573226368).

Almost surely, 2^3991684361 is an apocalyptic number.

It is an amenable number.

3991684361 is a deficient number, since it is larger than the sum of its proper divisors (594126583).

3991684361 is a wasteful number, since it uses less digits than its factorization.

3991684361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985751.

The product of its digits is 839808, while the sum is 50.

The square root of 3991684361 is about 63179.7781018579. The cubic root of 3991684361 is about 1586.3002676303.

The spelling of 3991684361 in words is "three billion, nine hundred ninety-one million, six hundred eighty-four thousand, three hundred sixty-one".