612216225 has 30 divisors (see below), whose sum is σ = 1134039830. Its totient is φ = 326514240.

The previous prime is 612216221. The next prime is 612216239. The reversal of 612216225 is 522612216.

612216225 is a `hidden beast` number, since 6 + 12 + 21 + 622 + 5 = 666.

612216225 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 173606976 + 438609249 = 13176^2 + 20943^2 .

It is not a de Polignac number, because 612216225 - 2² = 612216221 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (612216221) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 149140 + ... + 153189.

Almost surely, 2^612216225 is an apocalyptic number.

It is an amenable number.

612216225 is a deficient number, since it is larger than the sum of its proper divisors (521823605).

612216225 is a wasteful number, since it uses less digits than its factorization.

612216225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302351 (or 302337 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 612216225 is about 24743.0035565612. The cubic root of 612216225 is about 849.1184516771.

The spelling of 612216225 in words is "six hundred twelve million, two hundred sixteen thousand, two hundred twenty-five".