8113981 has 4 divisors (see below), whose sum is σ = 8591292. Its totient is φ = 7636672.

The previous prime is 8113979. The next prime is 8113993. The reversal of 8113981 is 1893118.

8113981 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 4995225 = 1766^2 + 2235^2 .

It is not a de Polignac number, because 8113981 - 2¹ = 8113979 is a prime.

It is a super-2 number, since 2×8113981² = 131673375336722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8113961) 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, 238630 + ... + 238663.

It is an arithmetic number, because the mean of its divisors is an integer number (2147823).

Almost surely, 2^8113981 is an apocalyptic number.

It is an amenable number.

8113981 is a deficient number, since it is larger than the sum of its proper divisors (477311).

8113981 is a wasteful number, since it uses less digits than its factorization.

8113981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477310.

The product of its digits is 1728, while the sum is 31.

The square root of 8113981 is about 2848.5050465112. The cubic root of 8113981 is about 200.9453660412.

The spelling of 8113981 in words is "eight million, one hundred thirteen thousand, nine hundred eighty-one".