243261530 has 16 divisors (see below), whose sum is σ = 442207944. Its totient is φ = 96340800.

The previous prime is 243261527. The next prime is 243261533. The reversal of 243261530 is 35162342.

It is an interprime number because it is at equal distance from previous prime (243261527) and next prime (243261533).

It can be written as a sum of positive squares in 4 ways, for example, as 193460281 + 49801249 = 13909^2 + 7057^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243261530.

It is not an unprimeable number, because it can be changed into a prime (243261533) 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 7 ways as a sum of consecutive naturals, for example, 119417 + ... + 121436.

Almost surely, 2^243261530 is an apocalyptic number.

243261530 is a deficient number, since it is larger than the sum of its proper divisors (198946414).

243261530 is a wasteful number, since it uses less digits than its factorization.

243261530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240961.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 243261530 is about 15596.8435909321. The cubic root of 243261530 is about 624.2489367412.

The spelling of 243261530 in words is "two hundred forty-three million, two hundred sixty-one thousand, five hundred thirty".