161365 has 8 divisors (see below), whose sum is σ = 197280. Its totient is φ = 126672.

The previous prime is 161363. The next prime is 161377. The reversal of 161365 is 563161.

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 161365 - 2¹ = 161363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161363) 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, 22 + ... + 568.

It is an arithmetic number, because the mean of its divisors is an integer number (24660).

2¹⁶¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

161365 is a deficient number, since it is larger than the sum of its proper divisors (35915).

161365 is an equidigital number, since it uses as much as digits as its factorization.

161365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its digits is 540, while the sum is 22.

The square root of 161365 is about 401.7026263295. The cubic root of 161365 is about 54.4422978776.

The spelling of 161365 in words is "one hundred sixty-one thousand, three hundred sixty-five".