181675145 has 4 divisors (see below), whose sum is σ = 218010180. Its totient is φ = 145340112.

The previous prime is 181675127. The next prime is 181675147. The reversal of 181675145 is 541576181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541576181 = 19991 ⋅27091.

It can be written as a sum of positive squares in 2 ways, for example, as 50183056 + 131492089 = 7084^2 + 11467^2 .

It is a cyclic number.

It is not a de Polignac number, because 181675145 - 2²⁰ = 180626569 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181675099 and 181675108.

It is not an unprimeable number, because it can be changed into a prime (181675147) 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, 18167510 + ... + 18167519.

It is an arithmetic number, because the mean of its divisors is an integer number (54502545).

Almost surely, 2^181675145 is an apocalyptic number.

It is an amenable number.

181675145 is a deficient number, since it is larger than the sum of its proper divisors (36335035).

181675145 is an equidigital number, since it uses as much as digits as its factorization.

181675145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36335034.

The product of its digits is 33600, while the sum is 38.

The square root of 181675145 is about 13478.6922585242. The cubic root of 181675145 is about 566.3677360292.

The spelling of 181675145 in words is "one hundred eighty-one million, six hundred seventy-five thousand, one hundred forty-five".