231121208 has 16 divisors (see below), whose sum is σ = 434346000. Its totient is φ = 115295616.

The previous prime is 231121207. The next prime is 231121217. The reversal of 231121208 is 802121132.

It is a self number, because there is not a number n which added to its sum of digits gives 231121208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231121207) 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 3 ways as a sum of consecutive naturals, for example, 29393 + ... + 36416.

It is an arithmetic number, because the mean of its divisors is an integer number (27146625).

Almost surely, 2^231121208 is an apocalyptic number.

It is an amenable number.

231121208 is a deficient number, since it is larger than the sum of its proper divisors (203224792).

231121208 is a wasteful number, since it uses less digits than its factorization.

231121208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66254 (or 66250 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 231121208 is about 15202.6710810962. The cubic root of 231121208 is about 613.6865422477.

The spelling of 231121208 in words is "two hundred thirty-one million, one hundred twenty-one thousand, two hundred eight".