161825 has 6 divisors (see below), whose sum is σ = 200694. Its totient is φ = 129440.

The previous prime is 161807. The next prime is 161831. The reversal of 161825 is 528161.

It can be written as a sum of positive squares in 3 ways, for example, as 1024 + 160801 = 32^2 + 401^2 .

It is not a de Polignac number, because 161825 - 2⁶ = 161761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161825.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161825.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 3212 + ... + 3261.

It is an arithmetic number, because the mean of its divisors is an integer number (33449).

2¹⁶¹⁸²⁵ is an apocalyptic number.

It is an amenable number.

161825 is a deficient number, since it is larger than the sum of its proper divisors (38869).

161825 is an equidigital number, since it uses as much as digits as its factorization.

161825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483 (or 6478 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 161825 is about 402.2747817102. The cubic root of 161825 is about 54.4939813234.

Adding to 161825 its reverse (528161), we get a palindrome (689986).

The spelling of 161825 in words is "one hundred sixty-one thousand, eight hundred twenty-five".