225571791 has 16 divisors (see below), whose sum is σ = 310087008. Its totient is φ = 145766400.

The previous prime is 225571777. The next prime is 225571813. The reversal of 225571791 is 197175522.

It is a happy number.

It is not a de Polignac number, because 225571791 - 2¹⁸ = 225309647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225571711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13471 + ... + 25151.

It is an arithmetic number, because the mean of its divisors is an integer number (19380438).

Almost surely, 2^225571791 is an apocalyptic number.

225571791 is a deficient number, since it is larger than the sum of its proper divisors (84515217).

225571791 is a wasteful number, since it uses less digits than its factorization.

225571791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11882.

The product of its digits is 44100, while the sum is 39.

The square root of 225571791 is about 15019.0476062898. The cubic root of 225571791 is about 608.7349857085.

The spelling of 225571791 in words is "two hundred twenty-five million, five hundred seventy-one thousand, seven hundred ninety-one".