8817981 has 16 divisors (see below), whose sum is σ = 12372480. Its totient is φ = 5578560.

The previous prime is 8817973. The next prime is 8818009. The reversal of 8817981 is 1897188.

8817981 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8817981 - 2³ = 8817973 is a prime.

It is a super-2 number, since 2×8817981² = 155513577832722, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8817931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4035 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (773280).

Almost surely, 2^8817981 is an apocalyptic number.

It is an amenable number.

8817981 is a deficient number, since it is larger than the sum of its proper divisors (3554499).

8817981 is a wasteful number, since it uses less digits than its factorization.

8817981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

The product of its digits is 32256, while the sum is 42.

The square root of 8817981 is about 2969.5085451973. The cubic root of 8817981 is about 206.5965443104.

The spelling of 8817981 in words is "eight million, eight hundred seventeen thousand, nine hundred eighty-one".