165481 has 4 divisors (see below), whose sum is σ = 166912. Its totient is φ = 164052.

The previous prime is 165479. The next prime is 165511. The reversal of 165481 is 184561.

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: 184561 = 13 ⋅14197.

It is a cyclic number.

It is not a de Polignac number, because 165481 - 2¹ = 165479 is a prime.

It is a super-2 number, since 2×165481² = 54767922722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (165181) 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, 525 + ... + 778.

It is an arithmetic number, because the mean of its divisors is an integer number (41728).

2¹⁶⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

165481 is a deficient number, since it is larger than the sum of its proper divisors (1431).

165481 is a wasteful number, since it uses less digits than its factorization.

165481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430.

The product of its digits is 960, while the sum is 25.

The square root of 165481 is about 406.7935594377. The cubic root of 165481 is about 54.9013106257.

It can be divided in two parts, 165 and 481, that added together give a palindrome (646).

The spelling of 165481 in words is "one hundred sixty-five thousand, four hundred eighty-one".