218471225 has 12 divisors (see below), whose sum is σ = 309605184. Its totient is φ = 149808720.

The previous prime is 218471219. The next prime is 218471263. The reversal of 218471225 is 522174812.

218471225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218471225 - 2⁶ = 218471161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218471191 and 218471200.

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, 624029 + ... + 624378.

It is an arithmetic number, because the mean of its divisors is an integer number (25800432).

Almost surely, 2^218471225 is an apocalyptic number.

218471225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

218471225 is a deficient number, since it is larger than the sum of its proper divisors (91133959).

218471225 is a wasteful number, since it uses less digits than its factorization.

218471225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248424 (or 1248419 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 218471225 is about 14780.7721381530. The cubic root of 218471225 is about 602.2795001277.

The spelling of 218471225 in words is "two hundred eighteen million, four hundred seventy-one thousand, two hundred twenty-five".