161125 has 8 divisors (see below), whose sum is σ = 201240. Its totient is φ = 128800.

The previous prime is 161123. The next prime is 161137. The reversal of 161125 is 521161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 324 + 160801 = 18^2 + 401^2 .

It is not a de Polignac number, because 161125 - 2¹ = 161123 is a prime.

It is a super-2 number, since 2×161125² = 51922531250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161099 and 161108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (25155).

2¹⁶¹¹²⁵ is an apocalyptic number.

It is an amenable number.

161125 is a deficient number, since it is larger than the sum of its proper divisors (40115).

161125 is an equidigital number, since it uses as much as digits as its factorization.

161125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1294 counting only the distinct ones).

The product of its digits is 60, while the sum is 16.

The square root of 161125 is about 401.4037867285. The cubic root of 161125 is about 54.4152936023.

Adding to 161125 its reverse (521161), we get a palindrome (682286).

The spelling of 161125 in words is "one hundred sixty-one thousand, one hundred twenty-five".