181536225 has 24 divisors (see below), whose sum is σ = 323229312. Its totient is φ = 89371200.

The previous prime is 181536211. The next prime is 181536247. The reversal of 181536225 is 522635181.

It is not a de Polignac number, because 181536225 - 2⁴ = 181536209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92121 + ... + 94070.

It is an arithmetic number, because the mean of its divisors is an integer number (13467888).

Almost surely, 2^181536225 is an apocalyptic number.

181536225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181536225 is a deficient number, since it is larger than the sum of its proper divisors (141693087).

181536225 is a wasteful number, since it uses less digits than its factorization.

181536225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186217 (or 186212 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 181536225 is about 13473.5379540787. The cubic root of 181536225 is about 566.2233393390.

The spelling of 181536225 in words is "one hundred eighty-one million, five hundred thirty-six thousand, two hundred twenty-five".