225521831 has 8 divisors (see below), whose sum is σ = 235478880. Its totient is φ = 215577472.

The previous prime is 225521827. The next prime is 225521833. The reversal of 225521831 is 138125522.

225521831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 225521831 - 2² = 225521827 is a prime.

It is a super-2 number, since 2×225521831² = 101720192515185122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225521794 and 225521803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225521833) 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, 60971 + ... + 64563.

It is an arithmetic number, because the mean of its divisors is an integer number (29434860).

Almost surely, 2^225521831 is an apocalyptic number.

225521831 is a deficient number, since it is larger than the sum of its proper divisors (9957049).

225521831 is a wasteful number, since it uses less digits than its factorization.

225521831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6345.

The product of its digits is 4800, while the sum is 29.

The square root of 225521831 is about 15017.3842928787. The cubic root of 225521831 is about 608.6900411918.

The spelling of 225521831 in words is "two hundred twenty-five million, five hundred twenty-one thousand, eight hundred thirty-one".