231489647 has 2 divisors, whose sum is σ = 231489648. Its totient is φ = 231489646.

The previous prime is 231489581. The next prime is 231489659. The reversal of 231489647 is 746984132.

231489647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231489647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231489598 and 231489607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231489547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115744823 + 115744824.

It is an arithmetic number, because the mean of its divisors is an integer number (115744824).

Almost surely, 2^231489647 is an apocalyptic number.

231489647 is a deficient number, since it is larger than the sum of its proper divisors (1).

231489647 is an equidigital number, since it uses as much as digits as its factorization.

231489647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 231489647 is about 15214.7838302094. The cubic root of 231489647 is about 614.0124693751.

The spelling of 231489647 in words is "two hundred thirty-one million, four hundred eighty-nine thousand, six hundred forty-seven".