100875809 has 2 divisors, whose sum is σ = 100875810. Its totient is φ = 100875808.

The previous prime is 100875791. The next prime is 100875839. The reversal of 100875809 is 908578001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68840209 + 32035600 = 8297^2 + 5660^2 .

It is an emirp because it is prime and its reverse (908578001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100875809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_5808854 and since 100875809 and 5808854 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (100875839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50437904 + 50437905.

It is an arithmetic number, because the mean of its divisors is an integer number (50437905).

Almost surely, 2^100875809 is an apocalyptic number.

It is an amenable number.

100875809 is a deficient number, since it is larger than the sum of its proper divisors (1).

100875809 is an equidigital number, since it uses as much as digits as its factorization.

100875809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 100875809 is about 10043.6949874038. The cubic root of 100875809 is about 465.5099950436.

The spelling of 100875809 in words is "one hundred million, eight hundred seventy-five thousand, eight hundred nine".