105543391 has 2 divisors, whose sum is σ = 105543392. Its totient is φ = 105543390.

The previous prime is 105543367. The next prime is 105543397. The reversal of 105543391 is 193345501.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 105543391 - 2¹⁷ = 105412319 is a prime.

It is a super-2 number, since 2×105543391² = 22278814767557762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105543397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52771695 + 52771696.

It is an arithmetic number, because the mean of its divisors is an integer number (52771696).

Almost surely, 2^105543391 is an apocalyptic number.

105543391 is a deficient number, since it is larger than the sum of its proper divisors (1).

105543391 is an equidigital number, since it uses as much as digits as its factorization.

105543391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 105543391 is about 10273.4313157776. The cubic root of 105543391 is about 472.5818243371.

Adding to 105543391 its reverse (193345501), we get a palindrome (298888892).

The spelling of 105543391 in words is "one hundred five million, five hundred forty-three thousand, three hundred ninety-one".