225945721 has 8 divisors (see below), whose sum is σ = 235920384. Its totient is φ = 215983680.

The previous prime is 225945719. The next prime is 225945749. The reversal of 225945721 is 127549522.

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 225945721 - 2¹ = 225945719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225945761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64936 + ... + 68326.

It is an arithmetic number, because the mean of its divisors is an integer number (29490048).

Almost surely, 2^225945721 is an apocalyptic number.

It is an amenable number.

225945721 is a deficient number, since it is larger than the sum of its proper divisors (9974663).

225945721 is a wasteful number, since it uses less digits than its factorization.

225945721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311.

The product of its digits is 50400, while the sum is 37.

The square root of 225945721 is about 15031.4909772783. The cubic root of 225945721 is about 609.0711663548.

The spelling of 225945721 in words is "two hundred twenty-five million, nine hundred forty-five thousand, seven hundred twenty-one".