8620981 has 4 divisors (see below), whose sum is σ = 8629612. Its totient is φ = 8612352.

The previous prime is 8620973. The next prime is 8620993. The reversal of 8620981 is 1890268.

8620981 is digitally balanced in base 2, 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7650756 + 970225 = 2766^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 8620981 - 2³ = 8620973 is a prime.

It is a super-2 number, since 2×8620981² = 148642626804722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8620951) 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, 2586 + ... + 4891.

It is an arithmetic number, because the mean of its divisors is an integer number (2157403).

Almost surely, 2^8620981 is an apocalyptic number.

It is an amenable number.

8620981 is a deficient number, since it is larger than the sum of its proper divisors (8631).

8620981 is a wasteful number, since it uses less digits than its factorization.

8620981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8630.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 8620981 is about 2936.1507113907. The cubic root of 8620981 is about 205.0464380223.

The spelling of 8620981 in words is "eight million, six hundred twenty thousand, nine hundred eighty-one".