231535225 has 6 divisors (see below), whose sum is σ = 287103710. Its totient is φ = 185228160.

The previous prime is 231535211. The next prime is 231535229. The reversal of 231535225 is 522535132.

It can be written as a sum of positive squares in 3 ways, for example, as 99856 + 231435369 = 316^2 + 15213^2 .

It is not a de Polignac number, because 231535225 - 2⁵ = 231535193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231535193 and 231535202.

It is not an unprimeable number, because it can be changed into a prime (231535229) 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, 4630680 + ... + 4630729.

Almost surely, 2^231535225 is an apocalyptic number.

231535225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231535225 is a deficient number, since it is larger than the sum of its proper divisors (55568485).

231535225 is an equidigital number, since it uses as much as digits as its factorization.

231535225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9261419 (or 9261414 counting only the distinct ones).

The product of its digits is 9000, while the sum is 28.

The square root of 231535225 is about 15216.2815759962. The cubic root of 231535225 is about 614.0527643720.

The spelling of 231535225 in words is "two hundred thirty-one million, five hundred thirty-five thousand, two hundred twenty-five".