225722171 has 4 divisors (see below), whose sum is σ = 227831832. Its totient is φ = 223612512.

The previous prime is 225722149. The next prime is 225722183. The reversal of 225722171 is 171227522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225722171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225722111) 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, 1054670 + ... + 1054883.

It is an arithmetic number, because the mean of its divisors is an integer number (56957958).

Almost surely, 2^225722171 is an apocalyptic number.

225722171 is a deficient number, since it is larger than the sum of its proper divisors (2109661).

225722171 is a wasteful number, since it uses less digits than its factorization.

225722171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109660.

The product of its digits is 3920, while the sum is 29.

The square root of 225722171 is about 15024.0530816421. The cubic root of 225722171 is about 608.8702290264.

Adding to 225722171 its reverse (171227522), we get a palindrome (396949693).

The spelling of 225722171 in words is "two hundred twenty-five million, seven hundred twenty-two thousand, one hundred seventy-one".