191385828487 has 8 divisors (see below), whose sum is σ = 231592935456. Its totient is φ = 154395290112.

The previous prime is 191385828467. The next prime is 191385828497. The reversal of 191385828487 is 784828583191.

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

It is not a de Polignac number, because 191385828487 - 2¹⁹ = 191385304199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191385828407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804142018 + ... + 804142255.

It is an arithmetic number, because the mean of its divisors is an integer number (28949116932).

Almost surely, 2^191385828487 is an apocalyptic number.

191385828487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

191385828487 is a deficient number, since it is larger than the sum of its proper divisors (40207106969).

191385828487 is a wasteful number, since it uses less digits than its factorization.

191385828487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608284297.

The product of its digits is 30965760, while the sum is 64.

The spelling of 191385828487 in words is "one hundred ninety-one billion, three hundred eighty-five million, eight hundred twenty-eight thousand, four hundred eighty-seven".