225105521 has 16 divisors (see below), whose sum is σ = 244306560. Its totient is φ = 207260208.

The previous prime is 225105499. The next prime is 225105527. The reversal of 225105521 is 125501522.

It is a de Polignac number, because none of the positive numbers 2^k-225105521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225105527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253340 + ... + 254226.

It is an arithmetic number, because the mean of its divisors is an integer number (15269160).

Almost surely, 2^225105521 is an apocalyptic number.

It is an amenable number.

225105521 is a deficient number, since it is larger than the sum of its proper divisors (19201039).

225105521 is an frugal number, since it uses more digits than its factorization.

225105521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 225105521 is about 15003.5169543677. The cubic root of 225105521 is about 608.3152661843.

The spelling of 225105521 in words is "two hundred twenty-five million, one hundred five thousand, five hundred twenty-one".