231205399 has 2 divisors, whose sum is σ = 231205400. Its totient is φ = 231205398.

The previous prime is 231205397. The next prime is 231205411. The reversal of 231205399 is 993502132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231205399 - 2¹ = 231205397 is a prime.

Together with 231205397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231205391) 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, 115602699 + 115602700.

It is an arithmetic number, because the mean of its divisors is an integer number (115602700).

Almost surely, 2^231205399 is an apocalyptic number.

231205399 is a deficient number, since it is larger than the sum of its proper divisors (1).

231205399 is an equidigital number, since it uses as much as digits as its factorization.

231205399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 231205399 is about 15205.4397831829. The cubic root of 231205399 is about 613.7610494898.

The spelling of 231205399 in words is "two hundred thirty-one million, two hundred five thousand, three hundred ninety-nine".