100805399 has 2 divisors, whose sum is σ = 100805400. Its totient is φ = 100805398.

The previous prime is 100805381. The next prime is 100805401. The reversal of 100805399 is 993508001.

It is a strong prime.

It is an emirp because it is prime and its reverse (993508001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100805399 is a prime.

Together with 100805401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100805339) 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, 50402699 + 50402700.

It is an arithmetic number, because the mean of its divisors is an integer number (50402700).

Almost surely, 2^100805399 is an apocalyptic number.

100805399 is a deficient number, since it is larger than the sum of its proper divisors (1).

100805399 is an equidigital number, since it uses as much as digits as its factorization.

100805399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 100805399 is about 10040.1891914446. The cubic root of 100805399 is about 465.4016631984.

The spelling of 100805399 in words is "one hundred million, eight hundred five thousand, three hundred ninety-nine".