161799 has 8 divisors (see below), whose sum is σ = 235392. Its totient is φ = 98040.

The previous prime is 161783. The next prime is 161807. The reversal of 161799 is 997161.

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

It is not a de Polignac number, because 161799 - 2⁴ = 161783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 4903 = 161799 / (1 + 6 + 1 + 7 + 9 + 9).

161799 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161729) 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, 2419 + ... + 2484.

It is an arithmetic number, because the mean of its divisors is an integer number (29424).

2¹⁶¹⁷⁹⁹ is an apocalyptic number.

161799 is a deficient number, since it is larger than the sum of its proper divisors (73593).

161799 is a wasteful number, since it uses less digits than its factorization.

161799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917.

The product of its digits is 3402, while the sum is 33.

The square root of 161799 is about 402.2424641929. The cubic root of 161799 is about 54.4910626985.

The spelling of 161799 in words is "one hundred sixty-one thousand, seven hundred ninety-nine".