196991543 has 8 divisors (see below), whose sum is σ = 225468288. Its totient is φ = 168598584.

The previous prime is 196991539. The next prime is 196991549. The reversal of 196991543 is 345199691.

It is a happy number.

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

It is not a de Polignac number, because 196991543 - 2² = 196991539 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 (196991549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15821 + ... + 25382.

It is an arithmetic number, because the mean of its divisors is an integer number (28183536).

Almost surely, 2^196991543 is an apocalyptic number.

196991543 is a deficient number, since it is larger than the sum of its proper divisors (28476745).

196991543 is an equidigital number, since it uses as much as digits as its factorization.

196991543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41893.

The product of its digits is 262440, while the sum is 47.

The square root of 196991543 is about 14035.3675762340. The cubic root of 196991543 is about 581.8564603522.

The spelling of 196991543 in words is "one hundred ninety-six million, nine hundred ninety-one thousand, five hundred forty-three".