243023313 has 32 divisors (see below), whose sum is σ = 385572096. Its totient is φ = 134627328.

The previous prime is 243023303. The next prime is 243023371. The reversal of 243023313 is 313320342.

It is a de Polignac number, because none of the positive numbers 2^k-243023313 is a prime.

It is a super-2 number, since 2×243023313² = 118120661322991938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243023313.

It is not an unprimeable number, because it can be changed into a prime (243023303) 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 31 ways as a sum of consecutive naturals, for example, 7281 + ... + 23217.

It is an arithmetic number, because the mean of its divisors is an integer number (12049128).

Almost surely, 2^243023313 is an apocalyptic number.

243023313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

243023313 is a deficient number, since it is larger than the sum of its proper divisors (142548783).

243023313 is a wasteful number, since it uses less digits than its factorization.

243023313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15993.

The product of its (nonzero) digits is 1296, while the sum is 21.

The square root of 243023313 is about 15589.2050150096. The cubic root of 243023313 is about 624.0451022421.

Adding to 243023313 its reverse (313320342), we get a palindrome (556343655).

The spelling of 243023313 in words is "two hundred forty-three million, twenty-three thousand, three hundred thirteen".