3871081708781 has 4 divisors (see below), whose sum is σ = 4424093381472. Its totient is φ = 3318070036092.

The previous prime is 3871081708777. The next prime is 3871081708787. The reversal of 3871081708781 is 1878071801783.

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 not a de Polignac number, because 3871081708781 - 2² = 3871081708777 is a prime.

It is a super-3 number, since 3×3871081708781³ (a number of 39 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3871081708781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871081708787) 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, 276505836335 + ... + 276505836348.

It is an arithmetic number, because the mean of its divisors is an integer number (1106023345368).

Almost surely, 2^{3871081708781} is an apocalyptic number.

It is an amenable number.

3871081708781 is a deficient number, since it is larger than the sum of its proper divisors (553011672691).

3871081708781 is an equidigital number, since it uses as much as digits as its factorization.

3871081708781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553011672690.

The product of its (nonzero) digits is 4214784, while the sum is 59.

The spelling of 3871081708781 in words is "three trillion, eight hundred seventy-one billion, eighty-one million, seven hundred eight thousand, seven hundred eighty-one".