230561521 has 4 divisors (see below), whose sum is σ = 233719972. Its totient is φ = 227403072.

The previous prime is 230561509. The next prime is 230561533. The reversal of 230561521 is 125165032.

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

It is an interprime number because it is at equal distance from previous prime (230561509) and next prime (230561533).

It can be written as a sum of positive squares in 2 ways, for example, as 143400625 + 87160896 = 11975^2 + 9336^2 .

It is a cyclic number.

It is not a de Polignac number, because 230561521 - 2⁵ = 230561489 is a prime.

It is a super-2 number, since 2×230561521² = 106317229931666882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (230561581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1579116 + ... + 1579261.

It is an arithmetic number, because the mean of its divisors is an integer number (58429993).

Almost surely, 2^230561521 is an apocalyptic number.

It is an amenable number.

230561521 is a deficient number, since it is larger than the sum of its proper divisors (3158451).

230561521 is an equidigital number, since it uses as much as digits as its factorization.

230561521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158450.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 230561521 is about 15184.2524017483. The cubic root of 230561521 is about 613.1907706291.

The spelling of 230561521 in words is "two hundred thirty million, five hundred sixty-one thousand, five hundred twenty-one".