225738561 has 16 divisors (see below), whose sum is σ = 303936768. Its totient is φ = 149024400.

The previous prime is 225738547. The next prime is 225738571. The reversal of 225738561 is 165837522.

It is not a de Polignac number, because 225738561 - 2¹⁵ = 225705793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225738521) 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, 142906 + ... + 144476.

It is an arithmetic number, because the mean of its divisors is an integer number (18996048).

Almost surely, 2^225738561 is an apocalyptic number.

It is an amenable number.

225738561 is a deficient number, since it is larger than the sum of its proper divisors (78198207).

225738561 is a wasteful number, since it uses less digits than its factorization.

225738561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012.

The product of its digits is 100800, while the sum is 39.

The square root of 225738561 is about 15024.5985304101. The cubic root of 225738561 is about 608.8849656404.

The spelling of 225738561 in words is "two hundred twenty-five million, seven hundred thirty-eight thousand, five hundred sixty-one".