3981656281 has 8 divisors (see below), whose sum is σ = 4007150784. Its totient is φ = 3956200560.

The previous prime is 3981656249. The next prime is 3981656333. The reversal of 3981656281 is 1826561893.

3981656281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3981656281 - 2⁵ = 3981656249 is a prime.

It is a super-2 number, since 2×3981656281² = 31707173480053501922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981656221) 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, 212370 + ... + 230356.

It is an arithmetic number, because the mean of its divisors is an integer number (500893848).

Almost surely, 2^3981656281 is an apocalyptic number.

It is an amenable number.

3981656281 is a deficient number, since it is larger than the sum of its proper divisors (25494503).

3981656281 is a wasteful number, since it uses less digits than its factorization.

3981656281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19391.

The product of its digits is 622080, while the sum is 49.

The square root of 3981656281 is about 63100.3667263511. The cubic root of 3981656281 is about 1584.9707632259.

The spelling of 3981656281 in words is "three billion, nine hundred eighty-one million, six hundred fifty-six thousand, two hundred eighty-one".