231389399 has 2 divisors, whose sum is σ = 231389400. Its totient is φ = 231389398.

The previous prime is 231389393. The next prime is 231389419. The reversal of 231389399 is 993983132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231389399 - 2⁴ = 231389383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231389393) 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, 115694699 + 115694700.

It is an arithmetic number, because the mean of its divisors is an integer number (115694700).

Almost surely, 2^231389399 is an apocalyptic number.

231389399 is a deficient number, since it is larger than the sum of its proper divisors (1).

231389399 is an equidigital number, since it uses as much as digits as its factorization.

231389399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 231389399 is about 15211.4890461125. The cubic root of 231389399 is about 613.9238226324.

The spelling of 231389399 in words is "two hundred thirty-one million, three hundred eighty-nine thousand, three hundred ninety-nine".