225345561 has 12 divisors (see below), whose sum is σ = 349515792. Its totient is φ = 128768808.

The previous prime is 225345521. The next prime is 225345583. The reversal of 225345561 is 165543522.

It is not a de Polignac number, because 225345561 - 2⁹ = 225345049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225345511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 766335 + ... + 766628.

It is an arithmetic number, because the mean of its divisors is an integer number (29126316).

Almost surely, 2^225345561 is an apocalyptic number.

225345561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225345561 is a deficient number, since it is larger than the sum of its proper divisors (124170231).

225345561 is a wasteful number, since it uses less digits than its factorization.

225345561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532980 (or 1532973 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

The square root of 225345561 is about 15011.5142807113. The cubic root of 225345561 is about 608.5314138885.

The spelling of 225345561 in words is "two hundred twenty-five million, three hundred forty-five thousand, five hundred sixty-one".