231085209 has 8 divisors (see below), whose sum is σ = 321509952. Its totient is φ = 147358640.

The previous prime is 231085189. The next prime is 231085219. The reversal of 231085209 is 902580132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231085209 - 2⁹ = 231084697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231085219) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1674462 + ... + 1674599.

It is an arithmetic number, because the mean of its divisors is an integer number (40188744).

Almost surely, 2^231085209 is an apocalyptic number.

It is an amenable number.

231085209 is a deficient number, since it is larger than the sum of its proper divisors (90424743).

231085209 is a wasteful number, since it uses less digits than its factorization.

231085209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349087.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 231085209 is about 15201.4870654157. The cubic root of 231085209 is about 613.6546783769.

The spelling of 231085209 in words is "two hundred thirty-one million, eighty-five thousand, two hundred nine".