8161689 has 4 divisors (see below), whose sum is σ = 10882256. Its totient is φ = 5441124.

The previous prime is 8161687. The next prime is 8161753. The reversal of 8161689 is 9861618.

8161689 is digitally balanced in base 3, 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 Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8161689 - 2¹ = 8161687 is a prime.

It is a super-2 number, since 2×8161689² = 133226334665442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8161687) 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, 1360279 + ... + 1360284.

It is an arithmetic number, because the mean of its divisors is an integer number (2720564).

Almost surely, 2^8161689 is an apocalyptic number.

It is an amenable number.

8161689 is a deficient number, since it is larger than the sum of its proper divisors (2720567).

8161689 is a wasteful number, since it uses less digits than its factorization.

8161689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720566.

The product of its digits is 20736, while the sum is 39.

The square root of 8161689 is about 2856.8669902535. The cubic root of 8161689 is about 201.3384313603.

The spelling of 8161689 in words is "eight million, one hundred sixty-one thousand, six hundred eighty-nine".