191006543 has 64 divisors (see below), whose sum is σ = 264757248. Its totient is φ = 133539840.

The previous prime is 191006539. The next prime is 191006551. The reversal of 191006543 is 345600191.

It is not a de Polignac number, because 191006543 - 2² = 191006539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191006533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2690198 + ... + 2690268.

It is an arithmetic number, because the mean of its divisors is an integer number (4136832).

Almost surely, 2^191006543 is an apocalyptic number.

191006543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

191006543 is a deficient number, since it is larger than the sum of its proper divisors (73750705).

191006543 is a wasteful number, since it uses less digits than its factorization.

191006543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 191006543 is about 13820.5116764901. The cubic root of 191006543 is about 575.9030980491.

The spelling of 191006543 in words is "one hundred ninety-one million, six thousand, five hundred forty-three".