225781447 has 4 divisors (see below), whose sum is σ = 228639520. Its totient is φ = 222923376.

The previous prime is 225781429. The next prime is 225781469. The reversal of 225781447 is 744187522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 225781447 - 2⁷ = 225781319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225781417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428918 + ... + 1429075.

It is an arithmetic number, because the mean of its divisors is an integer number (57159880).

Almost surely, 2^225781447 is an apocalyptic number.

225781447 is a deficient number, since it is larger than the sum of its proper divisors (2858073).

225781447 is an equidigital number, since it uses as much as digits as its factorization.

225781447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858072.

The product of its digits is 125440, while the sum is 40.

The square root of 225781447 is about 15026.0256555085. The cubic root of 225781447 is about 608.9235220233.

It can be divided in two parts, 22578 and 1447, that added together give a square (24025 = 155²).

The spelling of 225781447 in words is "two hundred twenty-five million, seven hundred eighty-one thousand, four hundred forty-seven".