100543109 has 2 divisors, whose sum is σ = 100543110. Its totient is φ = 100543108.

The previous prime is 100543103. The next prime is 100543123. The reversal of 100543109 is 901345001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76562500 + 23980609 = 8750^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 100543109 - 2²⁴ = 83765893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100543103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50271554 + 50271555.

It is an arithmetic number, because the mean of its divisors is an integer number (50271555).

Almost surely, 2^100543109 is an apocalyptic number.

It is an amenable number.

100543109 is a deficient number, since it is larger than the sum of its proper divisors (1).

100543109 is an equidigital number, since it uses as much as digits as its factorization.

100543109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 100543109 is about 10027.1186788628. The cubic root of 100543109 is about 464.9976629165.

The spelling of 100543109 in words is "one hundred million, five hundred forty-three thousand, one hundred nine".