243530145 has 20 divisors (see below), whose sum is σ = 436551060. Its totient is φ = 129882528.

The previous prime is 243530137. The next prime is 243530149. The reversal of 243530145 is 541035342.

It can be written as a sum of positive squares in 2 ways, for example, as 137522529 + 106007616 = 11727^2 + 10296^2 .

It is not a de Polignac number, because 243530145 - 2³ = 243530137 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243530149) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 300250 + ... + 301059.

It is an arithmetic number, because the mean of its divisors is an integer number (21827553).

Almost surely, 2^243530145 is an apocalyptic number.

It is an amenable number.

243530145 is a deficient number, since it is larger than the sum of its proper divisors (193020915).

243530145 is an equidigital number, since it uses as much as digits as its factorization.

243530145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601326 (or 601317 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 243530145 is about 15605.4524125384. The cubic root of 243530145 is about 624.4786222520.

Adding to 243530145 its reverse (541035342), we get a palindrome (784565487).

The spelling of 243530145 in words is "two hundred forty-three million, five hundred thirty thousand, one hundred forty-five".