11431239999 has 4 divisors (see below), whose sum is σ = 15241653336. Its totient is φ = 7620826664.

The previous prime is 11431239991. The next prime is 11431240019. The reversal of 11431239999 is 99993213411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11431239999 - 2³ = 11431239991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11431239991) 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 3 ways as a sum of consecutive naturals, for example, 1905206664 + ... + 1905206669.

It is an arithmetic number, because the mean of its divisors is an integer number (3810413334).

Almost surely, 2^11431239999 is an apocalyptic number.

11431239999 is a deficient number, since it is larger than the sum of its proper divisors (3810413337).

11431239999 is an equidigital number, since it uses as much as digits as its factorization.

11431239999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810413336.

The product of its digits is 472392, while the sum is 51.

The spelling of 11431239999 in words is "eleven billion, four hundred thirty-one million, two hundred thirty-nine thousand, nine hundred ninety-nine".