199948129 has 2 divisors, whose sum is σ = 199948130. Its totient is φ = 199948128.

The previous prime is 199948123. The next prime is 199948139. The reversal of 199948129 is 921849991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127238400 + 72709729 = 11280^2 + 8527^2 .

It is an emirp because it is prime and its reverse (921849991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199948129 - 2³ = 199948121 is a prime.

It is not a weakly prime, because it can be changed into another prime (199948121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99974064 + 99974065.

It is an arithmetic number, because the mean of its divisors is an integer number (99974065).

Almost surely, 2^199948129 is an apocalyptic number.

It is an amenable number.

199948129 is a deficient number, since it is larger than the sum of its proper divisors (1).

199948129 is an equidigital number, since it uses as much as digits as its factorization.

199948129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 52.

The square root of 199948129 is about 14140.3015880143. The cubic root of 199948129 is about 584.7529860298.

The spelling of 199948129 in words is "one hundred ninety-nine million, nine hundred forty-eight thousand, one hundred twenty-nine".