181255225 has 6 divisors (see below), whose sum is σ = 224756510. Its totient is φ = 145004160.

The previous prime is 181255213. The next prime is 181255237. The reversal of 181255225 is 522552181.

It is an interprime number because it is at equal distance from previous prime (181255213) and next prime (181255237).

It can be written as a sum of positive squares in 3 ways, for example, as 514089 + 180741136 = 717^2 + 13444^2 .

It is a de Polignac number, because none of the positive numbers 2^k-181255225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3625080 + ... + 3625129.

Almost surely, 2^181255225 is an apocalyptic number.

It is an amenable number.

181255225 is a deficient number, since it is larger than the sum of its proper divisors (43501285).

181255225 is an equidigital number, since it uses as much as digits as its factorization.

181255225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7250219 (or 7250214 counting only the distinct ones).

The product of its digits is 8000, while the sum is 31.

The square root of 181255225 is about 13463.1060680662. The cubic root of 181255225 is about 565.9310360189.

The spelling of 181255225 in words is "one hundred eighty-one million, two hundred fifty-five thousand, two hundred twenty-five".