231340009 has 2 divisors, whose sum is σ = 231340010. Its totient is φ = 231340008.

The previous prime is 231339937. The next prime is 231340027. The reversal of 231340009 is 900043132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225090009 + 6250000 = 15003^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 231340009 - 2⁷ = 231339881 is a prime.

It is not a weakly prime, because it can be changed into another prime (231340069) 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 as a sum of consecutive naturals, namely, 115670004 + 115670005.

It is an arithmetic number, because the mean of its divisors is an integer number (115670005).

Almost surely, 2^231340009 is an apocalyptic number.

It is an amenable number.

231340009 is a deficient number, since it is larger than the sum of its proper divisors (1).

231340009 is an equidigital number, since it uses as much as digits as its factorization.

231340009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 231340009 is about 15209.8655155133. The cubic root of 231340009 is about 613.8801389036.

The spelling of 231340009 in words is "two hundred thirty-one million, three hundred forty thousand, nine".