225921971 has 4 divisors (see below), whose sum is σ = 246460344. Its totient is φ = 205383600.

The previous prime is 225921953. The next prime is 225921973. The reversal of 225921971 is 179129522.

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-225921971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225921973) 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, 10269170 + ... + 10269191.

It is an arithmetic number, because the mean of its divisors is an integer number (61615086).

Almost surely, 2^225921971 is an apocalyptic number.

225921971 is a deficient number, since it is larger than the sum of its proper divisors (20538373).

225921971 is a wasteful number, since it uses less digits than its factorization.

225921971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20538372.

The product of its digits is 22680, while the sum is 38.

The square root of 225921971 is about 15030.7009483923. The cubic root of 225921971 is about 609.0498250241.

The spelling of 225921971 in words is "two hundred twenty-five million, nine hundred twenty-one thousand, nine hundred seventy-one".