19387997271 has 48 divisors (see below), whose sum is σ = 30607799040. Its totient is φ = 12230170560.

The previous prime is 19387997243. The next prime is 19387997297. The reversal of 19387997271 is 17279978391.

It is a happy number.

It is not a de Polignac number, because 19387997271 - 2⁷ = 19387997143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19387997199 and 19387997208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19387997201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4758091 + ... + 4762163.

It is an arithmetic number, because the mean of its divisors is an integer number (637662480).

Almost surely, 2^19387997271 is an apocalyptic number.

19387997271 is a deficient number, since it is larger than the sum of its proper divisors (11219801769).

19387997271 is a wasteful number, since it uses less digits than its factorization.

19387997271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138 (or 5126 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 63.

The spelling of 19387997271 in words is "nineteen billion, three hundred eighty-seven million, nine hundred ninety-seven thousand, two hundred seventy-one".