165061 has 4 divisors (see below), whose sum is σ = 177772. Its totient is φ = 152352.

The previous prime is 165059. The next prime is 165079. The reversal of 165061 is 160561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160561 = 307 ⋅523.

It can be written as a sum of positive squares in 2 ways, for example, as 28900 + 136161 = 170^2 + 369^2 .

It is a cyclic number.

It is not a de Polignac number, because 165061 - 2¹ = 165059 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6336 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (44443).

2¹⁶⁵⁰⁶¹ is an apocalyptic number.

It is an amenable number.

165061 is a deficient number, since it is larger than the sum of its proper divisors (12711).

165061 is a wasteful number, since it uses less digits than its factorization.

165061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12710.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 165061 is about 406.2769991028. The cubic root of 165061 is about 54.8548237461.

It can be divided in two parts, 1650 and 61, that added together give a triangular number (1711 = T₅₈).

The spelling of 165061 in words is "one hundred sixty-five thousand, sixty-one".