231228725 has 96 divisors (see below), whose sum is σ = 376809216. Its totient is φ = 136857600.

The previous prime is 231228709. The next prime is 231228731. The reversal of 231228725 is 527822132.

It is not a de Polignac number, because 231228725 - 2⁴ = 231228709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231228691 and 231228700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3451142 + ... + 3451208.

It is an arithmetic number, because the mean of its divisors is an integer number (3925096).

Almost surely, 2^231228725 is an apocalyptic number.

231228725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231228725 is a deficient number, since it is larger than the sum of its proper divisors (145580491).

231228725 is a wasteful number, since it uses less digits than its factorization.

231228725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 170 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 231228725 is about 15206.2067919649. The cubic root of 231228725 is about 613.7816893031.

The spelling of 231228725 in words is "two hundred thirty-one million, two hundred twenty-eight thousand, seven hundred twenty-five".