231339609 has 12 divisors (see below), whose sum is σ = 335108436. Its totient is φ = 153787392.

The previous prime is 231339599. The next prime is 231339623. The reversal of 231339609 is 906933132.

It is a happy number.

231339609 is a `hidden beast` number, since 2 + 3 + 13 + 39 + 609 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 104101209 + 127238400 = 10203^2 + 11280^2 .

It is a de Polignac number, because none of the positive numbers 2^k-231339609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231339629) 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 11 ways as a sum of consecutive naturals, for example, 33232 + ... + 39585.

It is an arithmetic number, because the mean of its divisors is an integer number (27925703).

Almost surely, 2^231339609 is an apocalyptic number.

It is an amenable number.

231339609 is a deficient number, since it is larger than the sum of its proper divisors (103768827).

231339609 is a wasteful number, since it uses less digits than its factorization.

231339609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73176 (or 73173 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 36.

The square root of 231339609 is about 15209.8523661474. The cubic root of 231339609 is about 613.8797850922.

The spelling of 231339609 in words is "two hundred thirty-one million, three hundred thirty-nine thousand, six hundred nine".