225208409 has 4 divisors (see below), whose sum is σ = 226852404. Its totient is φ = 223564416.

The previous prime is 225208393. The next prime is 225208427. The reversal of 225208409 is 904802522.

225208409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112254025 + 112954384 = 10595^2 + 10628^2 .

It is a cyclic number.

It is not a de Polignac number, because 225208409 - 2⁴ = 225208393 is a prime.

It is a super-2 number, since 2×225208409² = 101437654968622562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225208429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821792 + ... + 822065.

It is an arithmetic number, because the mean of its divisors is an integer number (56713101).

Almost surely, 2^225208409 is an apocalyptic number.

It is an amenable number.

225208409 is a deficient number, since it is larger than the sum of its proper divisors (1643995).

225208409 is a wasteful number, since it uses less digits than its factorization.

225208409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643994.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 225208409 is about 15006.9453587331. The cubic root of 225208409 is about 608.4079320706.

The spelling of 225208409 in words is "two hundred twenty-five million, two hundred eight thousand, four hundred nine".