225640145 has 8 divisors (see below), whose sum is σ = 271726656. Its totient is φ = 179873136.

The previous prime is 225640109. The next prime is 225640147. The reversal of 225640145 is 541046522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225640145 - 2¹⁸ = 225378001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225640147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78317 + ... + 81146.

It is an arithmetic number, because the mean of its divisors is an integer number (33965832).

Almost surely, 2^225640145 is an apocalyptic number.

It is an amenable number.

225640145 is a deficient number, since it is larger than the sum of its proper divisors (46086511).

225640145 is a wasteful number, since it uses less digits than its factorization.

225640145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159751.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 225640145 is about 15021.3230109734. The cubic root of 225640145 is about 608.7964669024.

Adding to 225640145 its reverse (541046522), we get a palindrome (766686667).

The spelling of 225640145 in words is "two hundred twenty-five million, six hundred forty thousand, one hundred forty-five".