11111939789 has 8 divisors (see below), whose sum is σ = 12083572728. Its totient is φ = 10175639040.

The previous prime is 11111939779. The next prime is 11111939821. The reversal of 11111939789 is 98793911111.

It can be written as a sum of positive squares in 4 ways, for example, as 5375089225 + 5736850564 = 73315^2 + 75742^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111939789 - 2¹² = 11111935693 is a prime.

It is a super-2 number, since 2×11111939789² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111939719) 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 7 ways as a sum of consecutive naturals, for example, 8832392 + ... + 8833649.

It is an arithmetic number, because the mean of its divisors is an integer number (1510446591).

Almost surely, 2^11111939789 is an apocalyptic number.

It is an amenable number.

11111939789 is a deficient number, since it is larger than the sum of its proper divisors (971632939).

11111939789 is a wasteful number, since it uses less digits than its factorization.

11111939789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17666095.

The product of its digits is 122472, while the sum is 50.

The spelling of 11111939789 in words is "eleven billion, one hundred eleven million, nine hundred thirty-nine thousand, seven hundred eighty-nine".