199998990101 has 2 divisors, whose sum is σ = 199998990102. Its totient is φ = 199998990100.

The previous prime is 199998990097. The next prime is 199998990151. The reversal of 199998990101 is 101099899991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169228567876 + 30770422225 = 411374^2 + 175415^2 .

It is an emirp because it is prime and its reverse (101099899991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 101066866661 and 166668660101.

It is a cyclic number.

It is not a de Polignac number, because 199998990101 - 2² = 199998990097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199998990151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999495050 + 99999495051.

It is an arithmetic number, because the mean of its divisors is an integer number (99999495051).

Almost surely, 2^199998990101 is an apocalyptic number.

It is an amenable number.

199998990101 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998990101 is an equidigital number, since it uses as much as digits as its factorization.

199998990101 is an evil number, because the sum of its binary digits is even.

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

The spelling of 199998990101 in words is "one hundred ninety-nine billion, nine hundred ninety-eight million, nine hundred ninety thousand, one hundred one".