19381871149 has 4 divisors (see below), whose sum is σ = 19382320636. Its totient is φ = 19381421664.

The previous prime is 19381871111. The next prime is 19381871191. The reversal of 19381871149 is 94117818391.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14204349124 + 5177522025 = 119182^2 + 71955^2 .

It is a cyclic number.

It is not a de Polignac number, because 19381871149 - 2⁹ = 19381870637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19381871096 and 19381871105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19381871549) 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, 152274 + ... + 248899.

It is an arithmetic number, because the mean of its divisors is an integer number (4845580159).

Almost surely, 2^19381871149 is an apocalyptic number.

It is an amenable number.

19381871149 is a deficient number, since it is larger than the sum of its proper divisors (449487).

19381871149 is an equidigital number, since it uses as much as digits as its factorization.

19381871149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449486.

The product of its digits is 435456, while the sum is 52.

The spelling of 19381871149 in words is "nineteen billion, three hundred eighty-one million, eight hundred seventy-one thousand, one hundred forty-nine".