199000981 has 2 divisors, whose sum is σ = 199000982.
Its totient is φ = 199000980.
The previous prime is 199000957. The next prime is 199001009. The reversal of 199000981 is 189000991.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 154778481 + 44222500 = 12441^2 + 6650^2
It is an emirp because it is prime and its reverse (189000991) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 199000981 - 29 = 199000469 is a prime.
It is a super-2 number, since 2×1990009812 = 79202780877924722, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 199000981.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (199000931) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99500490 + 99500491.
It is an arithmetic number, because the mean of its divisors is an integer number (99500491).
Almost surely, 2199000981 is an apocalyptic number.
It is an amenable number.
199000981 is a deficient number, since it is larger than the sum of its proper divisors (1).
199000981 is an equidigital number, since it uses as much as digits as its factorization.
199000981 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 5832, while the sum is 37.
The square root of 199000981 is about 14106.7707502461.
The cubic root of 199000981 is about 583.8282054341.
The spelling of 199000981 in words is "one hundred ninety-nine million, nine hundred eighty-one", and thus it is an aban number.