231231425 has 24 divisors (see below), whose sum is σ = 308864160. Its totient is φ = 171158400.

The previous prime is 231231409. The next prime is 231231439. The reversal of 231231425 is 524132132.

231231425 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 231231425 - 2⁴ = 231231409 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231231425.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14765 + ... + 26085.

It is an arithmetic number, because the mean of its divisors is an integer number (12869340).

Almost surely, 2^231231425 is an apocalyptic number.

231231425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231231425 is a deficient number, since it is larger than the sum of its proper divisors (77632735).

231231425 is a wasteful number, since it uses less digits than its factorization.

231231425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11393 (or 11388 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 231231425 is about 15206.2955712429. The cubic root of 231231425 is about 613.7840782855.

Adding to 231231425 its reverse (524132132), we get a palindrome (755363557).

The spelling of 231231425 in words is "two hundred thirty-one million, two hundred thirty-one thousand, four hundred twenty-five".