231305125 has 8 divisors (see below), whose sum is σ = 288668952. Its totient is φ = 185044000.

The previous prime is 231305119. The next prime is 231305141. The reversal of 231305125 is 521503132.

It can be written as a sum of positive squares in 4 ways, for example, as 5764801 + 225540324 = 2401^2 + 15018^2 .

It is not a de Polignac number, because 231305125 - 2²¹ = 229207973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231305096 and 231305105.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 925096 + ... + 925345.

It is an arithmetic number, because the mean of its divisors is an integer number (36083619).

Almost surely, 2^231305125 is an apocalyptic number.

231305125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231305125 is a deficient number, since it is larger than the sum of its proper divisors (57363827).

231305125 is an equidigital number, since it uses as much as digits as its factorization.

231305125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850456 (or 1850446 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 231305125 is about 15208.7187165783. The cubic root of 231305125 is about 613.8492814782.

Adding to 231305125 its reverse (521503132), we get a palindrome (752808257).

The spelling of 231305125 in words is "two hundred thirty-one million, three hundred five thousand, one hundred twenty-five".