225405561 has 16 divisors (see below), whose sum is σ = 309024000. Its totient is φ = 146072448.

The previous prime is 225405559. The next prime is 225405581. The reversal of 225405561 is 165504522.

It is not a de Polignac number, because 225405561 - 2¹ = 225405559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225405541) 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, 15645 + ... + 26373.

It is an arithmetic number, because the mean of its divisors is an integer number (19314000).

Almost surely, 2^225405561 is an apocalyptic number.

It is an amenable number.

225405561 is a deficient number, since it is larger than the sum of its proper divisors (83618439).

225405561 is a wasteful number, since it uses less digits than its factorization.

225405561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10928.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 225405561 is about 15013.5126136424. The cubic root of 225405561 is about 608.5854178290.

The spelling of 225405561 in words is "two hundred twenty-five million, four hundred five thousand, five hundred sixty-one".