243246253 has 4 divisors (see below), whose sum is σ = 245477980. Its totient is φ = 241014528.

The previous prime is 243246233. The next prime is 243246277. The reversal of 243246253 is 352642342.

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 96884649 + 146361604 = 9843^2 + 12098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243246253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243246233) 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, 1115700 + ... + 1115917.

It is an arithmetic number, because the mean of its divisors is an integer number (61369495).

Almost surely, 2^243246253 is an apocalyptic number.

It is an amenable number.

243246253 is a deficient number, since it is larger than the sum of its proper divisors (2231727).

243246253 is a wasteful number, since it uses less digits than its factorization.

243246253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231726.

The product of its digits is 34560, while the sum is 31.

The square root of 243246253 is about 15596.3538367145. The cubic root of 243246253 is about 624.2358687061.

Adding to 243246253 its reverse (352642342), we get a palindrome (595888595).

The spelling of 243246253 in words is "two hundred forty-three million, two hundred forty-six thousand, two hundred fifty-three".