231503225 has 6 divisors (see below), whose sum is σ = 287064030. Its totient is φ = 185202560.

The previous prime is 231503219. The next prime is 231503227. The reversal of 231503225 is 522305132.

It can be written as a sum of positive squares in 3 ways, for example, as 219961 + 231283264 = 469^2 + 15208^2 .

It is not a de Polignac number, because 231503225 - 2¹² = 231499129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231503225.

It is not an unprimeable number, because it can be changed into a prime (231503227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4630040 + ... + 4630089.

It is an arithmetic number, because the mean of its divisors is an integer number (47844005).

Almost surely, 2^231503225 is an apocalyptic number.

231503225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231503225 is a deficient number, since it is larger than the sum of its proper divisors (55560805).

231503225 is an equidigital number, since it uses as much as digits as its factorization.

231503225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260139 (or 9260134 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 231503225 is about 15215.2300344096. The cubic root of 231503225 is about 614.0244740852.

Adding to 231503225 its reverse (522305132), we get a palindrome (753808357).

The spelling of 231503225 in words is "two hundred thirty-one million, five hundred three thousand, two hundred twenty-five".