231399647 has 2 divisors, whose sum is σ = 231399648. Its totient is φ = 231399646.

The previous prime is 231399629. The next prime is 231399653. The reversal of 231399647 is 746993132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231399647 - 2⁸ = 231399391 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231399598 and 231399607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231399607) 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, 115699823 + 115699824.

It is an arithmetic number, because the mean of its divisors is an integer number (115699824).

Almost surely, 2^231399647 is an apocalyptic number.

231399647 is a deficient number, since it is larger than the sum of its proper divisors (1).

231399647 is an equidigital number, since it uses as much as digits as its factorization.

231399647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 44.

The square root of 231399647 is about 15211.8258930347. The cubic root of 231399647 is about 613.9328858515.

The spelling of 231399647 in words is "two hundred thirty-one million, three hundred ninety-nine thousand, six hundred forty-seven".