231210225 has 36 divisors (see below), whose sum is σ = 425331036. Its totient is φ = 119975040.

The previous prime is 231210223. The next prime is 231210227. The reversal of 231210225 is 522012132.

231210225 is a `hidden beast` number, since 231 + 210 + 225 = 666.

It is an interprime number because it is at equal distance from previous prime (231210223) and next prime (231210227).

It can be written as a sum of positive squares in 6 ways, for example, as 5489649 + 225720576 = 2343^2 + 15024^2 .

It is not a de Polignac number, because 231210225 - 2¹ = 231210223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231210198 and 231210207.

It is not an unprimeable number, because it can be changed into a prime (231210223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5562 + ... + 22211.

It is an arithmetic number, because the mean of its divisors is an integer number (11814751).

Almost surely, 2^231210225 is an apocalyptic number.

231210225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231210225 is a deficient number, since it is larger than the sum of its proper divisors (194120811).

231210225 is a wasteful number, since it uses less digits than its factorization.

231210225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27826 (or 27818 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 231210225 is about 15205.5984755616. The cubic root of 231210225 is about 613.7653198488.

Adding to 231210225 its reverse (522012132), we get a palindrome (753222357).

The spelling of 231210225 in words is "two hundred thirty-one million, two hundred ten thousand, two hundred twenty-five".