8939164561 has 4 divisors (see below), whose sum is σ = 8941261824. Its totient is φ = 8937067300.

The previous prime is 8939164547. The next prime is 8939164571. The reversal of 8939164561 is 1654619398.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8939164561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8939164499 and 8939164508.

It is not an unprimeable number, because it can be changed into a prime (8939164571) 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, 1042225 + ... + 1050766.

It is an arithmetic number, because the mean of its divisors is an integer number (2235315456).

Almost surely, 2^8939164561 is an apocalyptic number.

It is an amenable number.

8939164561 is a deficient number, since it is larger than the sum of its proper divisors (2097263).

8939164561 is a wasteful number, since it uses less digits than its factorization.

8939164561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097262.

The product of its digits is 1399680, while the sum is 52.

The square root of 8939164561 is about 94547.1552242583. The cubic root of 8939164561 is about 2075.3864523166.

The spelling of 8939164561 in words is "eight billion, nine hundred thirty-nine million, one hundred sixty-four thousand, five hundred sixty-one".