3981617931 has 4 divisors (see below), whose sum is σ = 5308823912. Its totient is φ = 2654411952.

The previous prime is 3981617921. The next prime is 3981617971. The reversal of 3981617931 is 1397161893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1397161893 = 3 ⋅465720631.

It is not a de Polignac number, because 3981617931 - 2¹⁰ = 3981616907 is a prime.

It is a super-2 number, since 2×3981617931² = 31706562696921441522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981617921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663602986 + ... + 663602991.

It is an arithmetic number, because the mean of its divisors is an integer number (1327205978).

Almost surely, 2^3981617931 is an apocalyptic number.

3981617931 is a deficient number, since it is larger than the sum of its proper divisors (1327205981).

3981617931 is a wasteful number, since it uses less digits than its factorization.

3981617931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327205980.

The product of its digits is 244944, while the sum is 48.

The square root of 3981617931 is about 63100.0628446597. The cubic root of 3981617931 is about 1584.9656745710.

The spelling of 3981617931 in words is "three billion, nine hundred eighty-one million, six hundred seventeen thousand, nine hundred thirty-one".