230105521 has 4 divisors (see below), whose sum is σ = 230757732. Its totient is φ = 229453312.

The previous prime is 230105497. The next prime is 230105543. The reversal of 230105521 is 125501032.

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 160149025 + 69956496 = 12655^2 + 8364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230105521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (230105581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325576 + ... + 326281.

It is an arithmetic number, because the mean of its divisors is an integer number (57689433).

Almost surely, 2^230105521 is an apocalyptic number.

It is an amenable number.

230105521 is a deficient number, since it is larger than the sum of its proper divisors (652211).

230105521 is an equidigital number, since it uses as much as digits as its factorization.

230105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652210.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 230105521 is about 15169.2294135200. The cubic root of 230105521 is about 612.7862516501.

Adding to 230105521 its reverse (125501032), we get a palindrome (355606553).

The spelling of 230105521 in words is "two hundred thirty million, one hundred five thousand, five hundred twenty-one".