11929781539 has 16 divisors (see below), whose sum is σ = 12939055360. Its totient is φ = 10933846560.

The previous prime is 11929781531. The next prime is 11929781543. The reversal of 11929781539 is 93518792911.

It is a happy number.

It is not a de Polignac number, because 11929781539 - 2³ = 11929781531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11929781539.

It is not an unprimeable number, because it can be changed into a prime (11929781531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199224 + ... + 1209130.

It is an arithmetic number, because the mean of its divisors is an integer number (808690960).

Almost surely, 2^11929781539 is an apocalyptic number.

11929781539 is a deficient number, since it is larger than the sum of its proper divisors (1009273821).

11929781539 is a wasteful number, since it uses less digits than its factorization.

11929781539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570.

The product of its digits is 1224720, while the sum is 55.

The spelling of 11929781539 in words is "eleven billion, nine hundred twenty-nine million, seven hundred eighty-one thousand, five hundred thirty-nine".