225031721 has 8 divisors (see below), whose sum is σ = 226670400. Its totient is φ = 223398448.

The previous prime is 225031621. The next prime is 225031727. The reversal of 225031721 is 127130522.

It is a happy number.

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 225031721 - 2¹⁰ = 225030697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225031727) 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, 117050 + ... + 118956.

It is an arithmetic number, because the mean of its divisors is an integer number (28333800).

Almost surely, 2^225031721 is an apocalyptic number.

It is an amenable number.

225031721 is a deficient number, since it is larger than the sum of its proper divisors (1638679).

225031721 is a wasteful number, since it uses less digits than its factorization.

225031721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 225031721 is about 15001.0573294018. The cubic root of 225031721 is about 608.2487809593.

The spelling of 225031721 in words is "two hundred twenty-five million, thirty-one thousand, seven hundred twenty-one".