199101901 has 2 divisors, whose sum is σ = 199101902. Its totient is φ = 199101900.

The previous prime is 199101857. The next prime is 199101923. The reversal of 199101901 is 109101991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199092100 + 9801 = 14110^2 + 99^2 .

It is an emirp because it is prime and its reverse (109101991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199101901 - 2⁹ = 199101389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199101701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99550950 + 99550951.

It is an arithmetic number, because the mean of its divisors is an integer number (99550951).

Almost surely, 2^199101901 is an apocalyptic number.

It is an amenable number.

199101901 is a deficient number, since it is larger than the sum of its proper divisors (1).

199101901 is an equidigital number, since it uses as much as digits as its factorization.

199101901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 199101901 is about 14110.3473026003. The cubic root of 199101901 is about 583.9268816399.

It can be divided in two parts, 199101 and 901, that added together give a palindrome (200002).

The spelling of 199101901 in words is "one hundred ninety-nine million, one hundred one thousand, nine hundred one".