11431320999 has 16 divisors (see below), whose sum is σ = 18443812608. Its totient is φ = 6147937152.

The previous prime is 11431320983. The next prime is 11431321049. The reversal of 11431320999 is 99902313411.

It is not a de Polignac number, because 11431320999 - 2⁴ = 11431320983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11431320999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11431320899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16009897 + ... + 16010610.

It is an arithmetic number, because the mean of its divisors is an integer number (1152738288).

Almost surely, 2^11431320999 is an apocalyptic number.

11431320999 is a deficient number, since it is larger than the sum of its proper divisors (7012491609).

11431320999 is a wasteful number, since it uses less digits than its factorization.

11431320999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32020534.

The product of its (nonzero) digits is 52488, while the sum is 42.

The spelling of 11431320999 in words is "eleven billion, four hundred thirty-one million, three hundred twenty thousand, nine hundred ninety-nine".