3981816159 has 4 divisors (see below), whose sum is σ = 5309088216. Its totient is φ = 2654544104.

The previous prime is 3981816121. The next prime is 3981816197. The reversal of 3981816159 is 9516181893.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3981816121) and next prime (3981816197).

It is a cyclic number.

It is not a de Polignac number, because 3981816159 - 2⁷ = 3981816031 is a prime.

It is a super-3 number, since 3×3981816159³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981816199) 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, 663636024 + ... + 663636029.

It is an arithmetic number, because the mean of its divisors is an integer number (1327272054).

Almost surely, 2^3981816159 is an apocalyptic number.

3981816159 is a deficient number, since it is larger than the sum of its proper divisors (1327272057).

3981816159 is a wasteful number, since it uses less digits than its factorization.

3981816159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327272056.

The product of its digits is 466560, while the sum is 51.

The square root of 3981816159 is about 63101.6335683950. The cubic root of 3981816159 is about 1584.9919770580.

The spelling of 3981816159 in words is "three billion, nine hundred eighty-one million, eight hundred sixteen thousand, one hundred fifty-nine".