169381 has 4 divisors (see below), whose sum is σ = 171072. Its totient is φ = 167692.

The previous prime is 169373. The next prime is 169399. The reversal of 169381 is 183961.

It is a happy number.

169381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 183961 = 71 ⋅2591.

It is a cyclic number.

It is not a de Polignac number, because 169381 - 2³ = 169373 is a prime.

It is a super-2 number, since 2×169381² = 57379846322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

169381 is a lucky 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 (169321) 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, 685 + ... + 898.

It is an arithmetic number, because the mean of its divisors is an integer number (42768).

2¹⁶⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

169381 is a deficient number, since it is larger than the sum of its proper divisors (1691).

169381 is a wasteful number, since it uses less digits than its factorization.

169381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690.

The product of its digits is 1296, while the sum is 28.

The square root of 169381 is about 411.5592302452. The cubic root of 169381 is about 55.3292645514.

The spelling of 169381 in words is "one hundred sixty-nine thousand, three hundred eighty-one".