199044121 has 2 divisors, whose sum is σ = 199044122. Its totient is φ = 199044120.

The previous prime is 199044113. The next prime is 199044161. The reversal of 199044121 is 121440991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159668496 + 39375625 = 12636^2 + 6275^2 .

It is a cyclic number.

It is not a de Polignac number, because 199044121 - 2³ = 199044113 is a prime.

It is not a weakly prime, because it can be changed into another prime (199044161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99522060 + 99522061.

It is an arithmetic number, because the mean of its divisors is an integer number (99522061).

Almost surely, 2^199044121 is an apocalyptic number.

It is an amenable number.

199044121 is a deficient number, since it is larger than the sum of its proper divisors (1).

199044121 is an equidigital number, since it uses as much as digits as its factorization.

199044121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 199044121 is about 14108.2997203774. The cubic root of 199044121 is about 583.8703903669.

It can be divided in two parts, 19904 and 4121, that added together give a square (24025 = 155²).

The spelling of 199044121 in words is "one hundred ninety-nine million, forty-four thousand, one hundred twenty-one".