103991543 has 4 divisors (see below), whose sum is σ = 104223600. Its totient is φ = 103759488.

The previous prime is 103991521. The next prime is 103991551. The reversal of 103991543 is 345199301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 103991543 - 2⁶ = 103991479 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 (103991743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115355 + ... + 116252.

It is an arithmetic number, because the mean of its divisors is an integer number (26055900).

Almost surely, 2^103991543 is an apocalyptic number.

103991543 is a deficient number, since it is larger than the sum of its proper divisors (232057).

103991543 is an equidigital number, since it uses as much as digits as its factorization.

103991543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232056.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 103991543 is about 10197.6243802172. The cubic root of 103991543 is about 470.2541902515.

The spelling of 103991543 in words is "one hundred three million, nine hundred ninety-one thousand, five hundred forty-three".