225665891 has 8 divisors (see below), whose sum is σ = 250826544. Its totient is φ = 201279520.

The previous prime is 225665887. The next prime is 225665897. The reversal of 225665891 is 198566522.

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 225665891 - 2² = 225665887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225665897) 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, 192956 + ... + 194121.

It is an arithmetic number, because the mean of its divisors is an integer number (31353318).

Almost surely, 2^225665891 is an apocalyptic number.

225665891 is a deficient number, since it is larger than the sum of its proper divisors (25160653).

225665891 is a wasteful number, since it uses less digits than its factorization.

225665891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387141.

The product of its digits is 259200, while the sum is 44.

The square root of 225665891 is about 15022.1799683002. The cubic root of 225665891 is about 608.8196209939.

The spelling of 225665891 in words is "two hundred twenty-five million, six hundred sixty-five thousand, eight hundred ninety-one".