225621345 has 16 divisors (see below), whose sum is σ = 361674432. Its totient is φ = 120104640.

The previous prime is 225621343. The next prime is 225621391. The reversal of 225621345 is 543126522.

It is not a de Polignac number, because 225621345 - 2¹ = 225621343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225621343) 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, 5787 + ... + 22016.

It is an arithmetic number, because the mean of its divisors is an integer number (22604652).

Almost surely, 2^225621345 is an apocalyptic number.

It is an amenable number.

225621345 is a deficient number, since it is larger than the sum of its proper divisors (136053087).

225621345 is a wasteful number, since it uses less digits than its factorization.

225621345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28352.

The product of its digits is 14400, while the sum is 30.

The square root of 225621345 is about 15020.6972208350. The cubic root of 225621345 is about 608.7795584285.

Adding to 225621345 its reverse (543126522), we get a palindrome (768747867).

The spelling of 225621345 in words is "two hundred twenty-five million, six hundred twenty-one thousand, three hundred forty-five".