231643125 has 160 divisors (see below), whose sum is σ = 512835840. Its totient is φ = 101088000.

The previous prime is 231643121. The next prime is 231643127. The reversal of 231643125 is 521346132.

231643125 is a `hidden beast` number, since 2 + 3 + 1 + 643 + 12 + 5 = 666.

It is not a de Polignac number, because 231643125 - 2² = 231643121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231643121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4370599 + ... + 4370651.

It is an arithmetic number, because the mean of its divisors is an integer number (3205224).

Almost surely, 2^231643125 is an apocalyptic number.

231643125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231643125 is an abundant number, since it is smaller than the sum of its proper divisors (281192715).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231643125 is an equidigital number, since it uses as much as digits as its factorization.

231643125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 105 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 231643125 is about 15219.8267072920. The cubic root of 231643125 is about 614.1481364746.

Adding to 231643125 its reverse (521346132), we get a palindrome (752989257).

The spelling of 231643125 in words is "two hundred thirty-one million, six hundred forty-three thousand, one hundred twenty-five".