428128171191 has 16 divisors (see below), whose sum is σ = 724873094400. Its totient is φ = 244644669144.

The previous prime is 428128171187. The next prime is 428128171193. The reversal of 428128171191 is 191171821824.

428128171191 is a `hidden beast` number, since 4 + 281 + 281 + 7 + 1 + 1 + 91 = 666.

It is not a de Polignac number, because 428128171191 - 2² = 428128171187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428128171193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132614021 + ... + 1132614398.

It is an arithmetic number, because the mean of its divisors is an integer number (45304568400).

Almost surely, 2^428128171191 is an apocalyptic number.

428128171191 is a deficient number, since it is larger than the sum of its proper divisors (296744923209).

428128171191 is a wasteful number, since it uses less digits than its factorization.

428128171191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265228435 (or 2265228429 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The spelling of 428128171191 in words is "four hundred twenty-eight billion, one hundred twenty-eight million, one hundred seventy-one thousand, one hundred ninety-one".