169391 has 4 divisors (see below), whose sum is σ = 170352. Its totient is φ = 168432.

The previous prime is 169373. The next prime is 169399. The reversal of 169391 is 193961.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 193961 = 73 ⋅2657.

It is a cyclic number.

It is not a de Polignac number, because 169391 - 2⁶ = 169327 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131 + ... + 596.

It is an arithmetic number, because the mean of its divisors is an integer number (42588).

2¹⁶⁹³⁹¹ is an apocalyptic number.

169391 is a deficient number, since it is larger than the sum of its proper divisors (961).

169391 is an equidigital number, since it uses as much as digits as its factorization.

169391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960.

The product of its digits is 1458, while the sum is 29.

The square root of 169391 is about 411.5713789855. The cubic root of 169391 is about 55.3303533822.

The spelling of 169391 in words is "one hundred sixty-nine thousand, three hundred ninety-one".