3871681291 has 4 divisors (see below), whose sum is σ = 3966112584. Its totient is φ = 3777250000.

The previous prime is 3871681277. The next prime is 3871681309. The reversal of 3871681291 is 1921861783.

It is a happy number.

3871681291 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1921861783 = 8863 ⋅216841.

It is a cyclic number.

It is not a de Polignac number, because 3871681291 - 2²¹ = 3869584139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3871681271) 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, 47215585 + ... + 47215666.

It is an arithmetic number, because the mean of its divisors is an integer number (991528146).

Almost surely, 2^3871681291 is an apocalyptic number.

3871681291 is a deficient number, since it is larger than the sum of its proper divisors (94431293).

3871681291 is an equidigital number, since it uses as much as digits as its factorization.

3871681291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94431292.

The product of its digits is 145152, while the sum is 46.

The square root of 3871681291 is about 62222.8357679076. The cubic root of 3871681291 is about 1570.2417969102.

The spelling of 3871681291 in words is "three billion, eight hundred seventy-one million, six hundred eighty-one thousand, two hundred ninety-one".