161789 has 8 divisors (see below), whose sum is σ = 177408. Its totient is φ = 146880.

The previous prime is 161783. The next prime is 161807. The reversal of 161789 is 987161.

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

It is not a de Polignac number, because 161789 - 2⁴ = 161773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161783) 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, 374 + ... + 680.

It is an arithmetic number, because the mean of its divisors is an integer number (22176).

2¹⁶¹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

161789 is a deficient number, since it is larger than the sum of its proper divisors (15619).

161789 is a wasteful number, since it uses less digits than its factorization.

161789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355.

The product of its digits is 3024, while the sum is 32.

The square root of 161789 is about 402.2300336872. The cubic root of 161789 is about 54.4899400673.

The spelling of 161789 in words is "one hundred sixty-one thousand, seven hundred eighty-nine".