231280289 has 2 divisors, whose sum is σ = 231280290. Its totient is φ = 231280288.

The previous prime is 231280267. The next prime is 231280327. The reversal of 231280289 is 982082132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122766400 + 108513889 = 11080^2 + 10417^2 .

It is a cyclic number.

It is not a de Polignac number, because 231280289 - 2²⁰ = 230231713 is a prime.

It is not a weakly prime, because it can be changed into another prime (231180289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115640144 + 115640145.

It is an arithmetic number, because the mean of its divisors is an integer number (115640145).

Almost surely, 2^231280289 is an apocalyptic number.

It is an amenable number.

231280289 is a deficient number, since it is larger than the sum of its proper divisors (1).

231280289 is an equidigital number, since it uses as much as digits as its factorization.

231280289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 231280289 is about 15207.9021893225. The cubic root of 231280289 is about 613.8273103460.

The spelling of 231280289 in words is "two hundred thirty-one million, two hundred eighty thousand, two hundred eighty-nine".