231340393 has 2 divisors, whose sum is σ = 231340394. Its totient is φ = 231340392.

The previous prime is 231340309. The next prime is 231340397. The reversal of 231340393 is 393043132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156050064 + 75290329 = 12492^2 + 8677^2 .

It is a cyclic number.

It is not a de Polignac number, because 231340393 - 2⁹ = 231339881 is a prime.

It is not a weakly prime, because it can be changed into another prime (231340397) 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 as a sum of consecutive naturals, namely, 115670196 + 115670197.

It is an arithmetic number, because the mean of its divisors is an integer number (115670197).

Almost surely, 2^231340393 is an apocalyptic number.

It is an amenable number.

231340393 is a deficient number, since it is larger than the sum of its proper divisors (1).

231340393 is an equidigital number, since it uses as much as digits as its factorization.

231340393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 231340393 is about 15209.8781388938. The cubic root of 231340393 is about 613.8804785621.

The spelling of 231340393 in words is "two hundred thirty-one million, three hundred forty thousand, three hundred ninety-three".