11912172839 has 4 divisors (see below), whose sum is σ = 13613911824. Its totient is φ = 10210433856.

The previous prime is 11912172803. The next prime is 11912172851. The reversal of 11912172839 is 93827121911.

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

It is a de Polignac number, because none of the positive numbers 2^k-11912172839 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 11912172839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11912172539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850869482 + ... + 850869495.

It is an arithmetic number, because the mean of its divisors is an integer number (3403477956).

Almost surely, 2^11912172839 is an apocalyptic number.

11912172839 is a deficient number, since it is larger than the sum of its proper divisors (1701738985).

11912172839 is an equidigital number, since it uses as much as digits as its factorization.

11912172839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701738984.

The product of its digits is 54432, while the sum is 44.

The spelling of 11912172839 in words is "eleven billion, nine hundred twelve million, one hundred seventy-two thousand, eight hundred thirty-nine".