161769 has 4 divisors (see below), whose sum is σ = 215696. Its totient is φ = 107844.

The previous prime is 161761. The next prime is 161771. The reversal of 161769 is 967161.

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 161769 - 2³ = 161761 is a prime.

It is a super-2 number, since 2×161769² = 52338418722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161761) 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, 26959 + ... + 26964.

It is an arithmetic number, because the mean of its divisors is an integer number (53924).

2¹⁶¹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

161769 is a deficient number, since it is larger than the sum of its proper divisors (53927).

161769 is an equidigital number, since it uses as much as digits as its factorization.

161769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53926.

The product of its digits is 2268, while the sum is 30.

The square root of 161769 is about 402.2051715232. The cubic root of 161769 is about 54.4876946659.

The spelling of 161769 in words is "one hundred sixty-one thousand, seven hundred sixty-nine".