231563489 has 2 divisors, whose sum is σ = 231563490. Its totient is φ = 231563488.

The previous prime is 231563429. The next prime is 231563491. The reversal of 231563489 is 984365132.

231563489 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 can be written as a sum of positive squares in only one way, i.e., 231557089 + 6400 = 15217^2 + 80^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231563489 is a prime.

Together with 231563491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231563429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115781744 + 115781745.

It is an arithmetic number, because the mean of its divisors is an integer number (115781745).

Almost surely, 2^231563489 is an apocalyptic number.

It is an amenable number.

231563489 is a deficient number, since it is larger than the sum of its proper divisors (1).

231563489 is an equidigital number, since it uses as much as digits as its factorization.

231563489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 231563489 is about 15217.2102896687. The cubic root of 231563489 is about 614.0777496000.

The spelling of 231563489 in words is "two hundred thirty-one million, five hundred sixty-three thousand, four hundred eighty-nine".