181665125 has 8 divisors (see below), whose sum is σ = 226718232. Its totient is φ = 145332000.

The previous prime is 181665103. The next prime is 181665157. The reversal of 181665125 is 521566181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 177608929 = 2014^2 + 13327^2 .

It is not a de Polignac number, because 181665125 - 2⁸ = 181664869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726536 + ... + 726785.

It is an arithmetic number, because the mean of its divisors is an integer number (28339779).

Almost surely, 2^181665125 is an apocalyptic number.

It is an amenable number.

181665125 is a deficient number, since it is larger than the sum of its proper divisors (45053107).

181665125 is an equidigital number, since it uses as much as digits as its factorization.

181665125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453336 (or 1453326 counting only the distinct ones).

The product of its digits is 14400, while the sum is 35.

The square root of 181665125 is about 13478.3205556182. The cubic root of 181665125 is about 566.3573234710.

The spelling of 181665125 in words is "one hundred eighty-one million, six hundred sixty-five thousand, one hundred twenty-five".