8681945 has 4 divisors (see below), whose sum is σ = 10418340. Its totient is φ = 6945552.

The previous prime is 8681941. The next prime is 8681957. The reversal of 8681945 is 5491868.

8681945 = 2083² + 2084².

8681945 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4338889 + 4343056 = 2083^2 + 2084^2 .

It is a cyclic number.

It is not a de Polignac number, because 8681945 - 2² = 8681941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8681941) 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, 868190 + ... + 868199.

It is an arithmetic number, because the mean of its divisors is an integer number (2604585).

Almost surely, 2^8681945 is an apocalyptic number.

8681945 is the 2084-th centered square number.

It is an amenable number.

8681945 is a deficient number, since it is larger than the sum of its proper divisors (1736395).

8681945 is a wasteful number, since it uses less digits than its factorization.

8681945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736394.

The product of its digits is 69120, while the sum is 41.

The square root of 8681945 is about 2946.5140420504. The cubic root of 8681945 is about 205.5286376028.

The spelling of 8681945 in words is "eight million, six hundred eighty-one thousand, nine hundred forty-five".