230405521 has 2 divisors, whose sum is σ = 230405522. Its totient is φ = 230405520.

The previous prime is 230405519. The next prime is 230405557. The reversal of 230405521 is 125504032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229219600 + 1185921 = 15140^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 230405521 - 2¹ = 230405519 is a prime.

Together with 230405519, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 230405492 and 230405501.

It is not a weakly prime, because it can be changed into another prime (230405921) 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 as a sum of consecutive naturals, namely, 115202760 + 115202761.

It is an arithmetic number, because the mean of its divisors is an integer number (115202761).

Almost surely, 2^230405521 is an apocalyptic number.

It is an amenable number.

230405521 is a deficient number, since it is larger than the sum of its proper divisors (1).

230405521 is an equidigital number, since it uses as much as digits as its factorization.

230405521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 230405521 is about 15179.1146316246. The cubic root of 230405521 is about 613.0524426285.

Adding to 230405521 its reverse (125504032), we get a palindrome (355909553).

It can be divided in two parts, 23040 and 5521, that added together give a 4-th power (28561 = 13⁴).

The spelling of 230405521 in words is "two hundred thirty million, four hundred five thousand, five hundred twenty-one".