199919099801 has 2 divisors, whose sum is σ = 199919099802. Its totient is φ = 199919099800.

The previous prime is 199919099773. The next prime is 199919099803. The reversal of 199919099801 is 108990919991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193406448400 + 6512651401 = 439780^2 + 80701^2 .

It is an emirp because it is prime and its reverse (108990919991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 108660616661 and 166616066801.

It is a cyclic number.

It is not a de Polignac number, because 199919099801 - 2²⁶ = 199851990937 is a prime.

Together with 199919099803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199919099803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99959549900 + 99959549901.

It is an arithmetic number, because the mean of its divisors is an integer number (99959549901).

Almost surely, 2^199919099801 is an apocalyptic number.

It is an amenable number.

199919099801 is a deficient number, since it is larger than the sum of its proper divisors (1).

199919099801 is an equidigital number, since it uses as much as digits as its factorization.

199919099801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4251528, while the sum is 65.

The spelling of 199919099801 in words is "one hundred ninety-nine billion, nine hundred nineteen million, ninety-nine thousand, eight hundred one".