8729161 has 8 divisors (see below), whose sum is σ = 10140224. Its totient is φ = 7359120.

The previous prime is 8729141. The next prime is 8729173. The reversal of 8729161 is 1619278.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8729161 - 2⁷ = 8729033 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (8729131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9795 + ... + 10648.

It is an arithmetic number, because the mean of its divisors is an integer number (1267528).

Almost surely, 2^8729161 is an apocalyptic number.

It is an amenable number.

8729161 is a deficient number, since it is larger than the sum of its proper divisors (1411063).

8729161 is a wasteful number, since it uses less digits than its factorization.

8729161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20511.

The product of its digits is 6048, while the sum is 34.

The square root of 8729161 is about 2954.5153578887. The cubic root of 8729161 is about 205.9005474005.

The spelling of 8729161 in words is "eight million, seven hundred twenty-nine thousand, one hundred sixty-one".