100009991819 has 2 divisors, whose sum is σ = 100009991820. Its totient is φ = 100009991818.

The previous prime is 100009991791. The next prime is 100009991867. The reversal of 100009991819 is 918199900001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100009991819 - 2¹² = 100009987723 is a prime.

It is a super-2 number, since 2×100009991819² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100009991899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50004995909 + 50004995910.

It is an arithmetic number, because the mean of its divisors is an integer number (50004995910).

Almost surely, 2^100009991819 is an apocalyptic number.

100009991819 is a deficient number, since it is larger than the sum of its proper divisors (1).

100009991819 is an equidigital number, since it uses as much as digits as its factorization.

100009991819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 100009991819 in words is "one hundred billion, nine million, nine hundred ninety-one thousand, eight hundred nineteen".