231235225 has 24 divisors (see below), whose sum is σ = 325048640. Its totient is φ = 161766720.

The previous prime is 231235171. The next prime is 231235229. The reversal of 231235225 is 522532132.

231235225 = T₃₉₀ + T₃₉₁ + ... + T₁₁₃₀.

It is not a de Polignac number, because 231235225 - 2⁷ = 231235097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 231235225.

It is not an unprimeable number, because it can be changed into a prime (231235229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12549 + ... + 24898.

Almost surely, 2^231235225 is an apocalyptic number.

231235225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231235225 is a deficient number, since it is larger than the sum of its proper divisors (93813415).

231235225 is a wasteful number, since it uses less digits than its factorization.

231235225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37489 (or 37484 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 231235225 is about 15206.4205189782. The cubic root of 231235225 is about 613.7874405257.

Adding to 231235225 its reverse (522532132), we get a palindrome (753767357).

The spelling of 231235225 in words is "two hundred thirty-one million, two hundred thirty-five thousand, two hundred twenty-five".