178061 has 4 divisors (see below), whose sum is σ = 191772. Its totient is φ = 164352.

The previous prime is 178039. The next prime is 178067. The reversal of 178061 is 160871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160871 = 17 ⋅9463.

It can be written as a sum of positive squares in 2 ways, for example, as 13225 + 164836 = 115^2 + 406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-178061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 178061.

It is not an unprimeable number, because it can be changed into a prime (178067) 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, 6836 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (47943).

2¹⁷⁸⁰⁶¹ is an apocalyptic number.

It is an amenable number.

178061 is a deficient number, since it is larger than the sum of its proper divisors (13711).

178061 is a wasteful number, since it uses less digits than its factorization.

178061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13710.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 178061 is about 421.9727479352. The cubic root of 178061 is about 56.2586883699.

Adding to 178061 its sum of digits (23), we get a square (178084 = 422²).

The spelling of 178061 in words is "one hundred seventy-eight thousand, sixty-one".