165081 has 12 divisors (see below), whose sum is σ = 256272. Its totient is φ = 94248.

The previous prime is 165079. The next prime is 165083. The reversal of 165081 is 180561.

165081 is nontrivially palindromic in base 6.

It is an interprime number because it is at equal distance from previous prime (165079) and next prime (165083).

It is not a de Polignac number, because 165081 - 2¹ = 165079 is a prime.

It is a super-2 number, since 2×165081² = 54503473122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

165081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (165083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 415 + ... + 708.

It is an arithmetic number, because the mean of its divisors is an integer number (21356).

2¹⁶⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

165081 is a deficient number, since it is larger than the sum of its proper divisors (91191).

165081 is a wasteful number, since it uses less digits than its factorization.

165081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 165081 is about 406.3016121061. The cubic root of 165081 is about 54.8570391941.

The spelling of 165081 in words is "one hundred sixty-five thousand, eighty-one".