199889000881 has 2 divisors, whose sum is σ = 199889000882.
Its totient is φ = 199889000880.
The previous prime is 199889000807. The next prime is 199889000933. The reversal of 199889000881 is 188000988991.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 112976654400 + 86912346481 = 336120^2 + 294809^2
It is an emirp because it is prime and its reverse (188000988991) is a distict prime.
It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 188000688661 and 166886000881.
It is a cyclic number.
It is not a de Polignac number, because 199889000881 - 221 = 199886903729 is a prime.
It is a super-2 number, since 2×1998890008812 (a number of 23 digits) contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (199889000981) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99944500440 + 99944500441.
It is an arithmetic number, because the mean of its divisors is an integer number (99944500441).
Almost surely, 2199889000881 is an apocalyptic number.
It is an amenable number.
199889000881 is a deficient number, since it is larger than the sum of its proper divisors (1).
199889000881 is an equidigital number, since it uses as much as digits as its factorization.
199889000881 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2985984, while the sum is 61.
The spelling of 199889000881 in words is "one hundred ninety-nine billion, eight hundred eighty-nine million, eight hundred eighty-one", and thus it is an aban number.