243111403 has 16 divisors (see below), whose sum is σ = 268750080. Its totient is φ = 218886624.

The previous prime is 243111367. The next prime is 243111409. The reversal of 243111403 is 304111342.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243111403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243111409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69525 + ... + 72937.

It is an arithmetic number, because the mean of its divisors is an integer number (16796880).

Almost surely, 2^243111403 is an apocalyptic number.

243111403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

243111403 is a deficient number, since it is larger than the sum of its proper divisors (25638677).

243111403 is a wasteful number, since it uses less digits than its factorization.

243111403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 243111403 is about 15592.0301115666. The cubic root of 243111403 is about 624.1204934898.

Adding to 243111403 its reverse (304111342), we get a palindrome (547222745).

The spelling of 243111403 in words is "two hundred forty-three million, one hundred eleven thousand, four hundred three".