231920225 has 12 divisors (see below), whose sum is σ = 288855024. Its totient is φ = 184714320.

The previous prime is 231920219. The next prime is 231920257. The reversal of 231920225 is 522029132.

231920225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231920225 - 2⁸ = 231919969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231920194 and 231920203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14759 + ... + 26108.

It is an arithmetic number, because the mean of its divisors is an integer number (24071252).

Almost surely, 2^231920225 is an apocalyptic number.

231920225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231920225 is a deficient number, since it is larger than the sum of its proper divisors (56934799).

231920225 is a wasteful number, since it uses less digits than its factorization.

231920225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41104 (or 41099 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231920225 is about 15228.9272439000. The cubic root of 231920225 is about 614.3929277312.

Adding to 231920225 its reverse (522029132), we get a palindrome (753949357).

The spelling of 231920225 in words is "two hundred thirty-one million, nine hundred twenty thousand, two hundred twenty-five".