100811999 has 2 divisors, whose sum is σ = 100812000. Its totient is φ = 100811998.

The previous prime is 100811981. The next prime is 100812011. The reversal of 100811999 is 999118001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100811999 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 (100811959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50405999 + 50406000.

It is an arithmetic number, because the mean of its divisors is an integer number (50406000).

Almost surely, 2^100811999 is an apocalyptic number.

100811999 is a deficient number, since it is larger than the sum of its proper divisors (1).

100811999 is an equidigital number, since it uses as much as digits as its factorization.

100811999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 100811999 is about 10040.5178651303. The cubic root of 100811999 is about 465.4118200087.

The spelling of 100811999 in words is "one hundred million, eight hundred eleven thousand, nine hundred ninety-nine".