181632225 has 24 divisors (see below), whose sum is σ = 302679040. Its totient is φ = 96102720.

The previous prime is 181632221. The next prime is 181632251. The reversal of 181632225 is 522236181.

It is not a de Polignac number, because 181632225 - 2² = 181632221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181632192 and 181632201.

It is not an unprimeable number, because it can be changed into a prime (181632221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10 + ... + 19059.

Almost surely, 2^181632225 is an apocalyptic number.

181632225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181632225 is a deficient number, since it is larger than the sum of its proper divisors (121046815).

181632225 is a wasteful number, since it uses less digits than its factorization.

181632225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19209 (or 19204 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 181632225 is about 13477.1000218890. The cubic root of 181632225 is about 566.3231318398.

The spelling of 181632225 in words is "one hundred eighty-one million, six hundred thirty-two thousand, two hundred twenty-five".