230721289 has 4 divisors (see below), whose sum is σ = 232405524. Its totient is φ = 229037056.

The previous prime is 230721287. The next prime is 230721319. The reversal of 230721289 is 982127032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71961289 + 158760000 = 8483^2 + 12600^2 .

It is a cyclic number.

It is not a de Polignac number, because 230721289 - 2¹ = 230721287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (230721287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841912 + ... + 842185.

It is an arithmetic number, because the mean of its divisors is an integer number (58101381).

Almost surely, 2^230721289 is an apocalyptic number.

It is an amenable number.

230721289 is a deficient number, since it is larger than the sum of its proper divisors (1684235).

230721289 is a wasteful number, since it uses less digits than its factorization.

230721289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684234.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 230721289 is about 15189.5124674889. The cubic root of 230721289 is about 613.3323751232.

The spelling of 230721289 in words is "two hundred thirty million, seven hundred twenty-one thousand, two hundred eighty-nine".