181575725 has 12 divisors (see below), whose sum is σ = 238398804. Its totient is φ = 136715520.

The previous prime is 181575689. The next prime is 181575739. The reversal of 181575725 is 527575181.

It can be written as a sum of positive squares in 6 ways, for example, as 4206601 + 177369124 = 2051^2 + 13318^2 .

It is not a de Polignac number, because 181575725 - 2¹⁴ = 181559341 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 11 ways as a sum of consecutive naturals, for example, 213194 + ... + 214043.

It is an arithmetic number, because the mean of its divisors is an integer number (19866567).

Almost surely, 2^181575725 is an apocalyptic number.

It is an amenable number.

181575725 is a deficient number, since it is larger than the sum of its proper divisors (56823079).

181575725 is a wasteful number, since it uses less digits than its factorization.

181575725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427264 (or 427259 counting only the distinct ones).

The product of its digits is 98000, while the sum is 41.

The square root of 181575725 is about 13475.0037105746. The cubic root of 181575725 is about 566.2644040538.

The spelling of 181575725 in words is "one hundred eighty-one million, five hundred seventy-five thousand, seven hundred twenty-five".