19181111013 has 32 divisors (see below), whose sum is σ = 28862409600. Its totient is φ = 12587021568.

The previous prime is 19181111011. The next prime is 19181111039. The reversal of 19181111013 is 31011118191.

It is not a de Polignac number, because 19181111013 - 2¹ = 19181111011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19181111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3016045 + ... + 3022397.

It is an arithmetic number, because the mean of its divisors is an integer number (901950300).

Almost surely, 2^19181111013 is an apocalyptic number.

It is an amenable number.

19181111013 is a deficient number, since it is larger than the sum of its proper divisors (9681298587).

19181111013 is a wasteful number, since it uses less digits than its factorization.

19181111013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8098 (or 8092 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 27.

The spelling of 19181111013 in words is "nineteen billion, one hundred eighty-one million, one hundred eleven thousand, thirteen".