3873651978281 has 4 divisors (see below), whose sum is σ = 3873812848272. Its totient is φ = 3873491108292.

The previous prime is 3873651978253. The next prime is 3873651978331. The reversal of 3873651978281 is 1828791563783.

3873651978281 is digitally balanced in base 2, because in such base 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 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 3873651978281 - 2¹⁰ = 3873651977257 is a prime.

It is a super-2 number, since 2×3873651978281² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3873651978481) 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, 80398871 + ... + 80447036.

It is an arithmetic number, because the mean of its divisors is an integer number (968453212068).

Almost surely, 2^{3873651978281} is an apocalyptic number.

It is an amenable number.

3873651978281 is a deficient number, since it is larger than the sum of its proper divisors (160869991).

3873651978281 is a wasteful number, since it uses less digits than its factorization.

3873651978281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160869990.

The product of its digits is 121927680, while the sum is 68.

The spelling of 3873651978281 in words is "three trillion, eight hundred seventy-three billion, six hundred fifty-one million, nine hundred seventy-eight thousand, two hundred eighty-one".