199904261 has 2 divisors, whose sum is σ = 199904262. Its totient is φ = 199904260.

The previous prime is 199904249. The next prime is 199904273. The reversal of 199904261 is 162409991.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (199904249) and next prime (199904273).

It can be written as a sum of positive squares in only one way, i.e., 128822500 + 71081761 = 11350^2 + 8431^2 .

It is a cyclic number.

It is not a de Polignac number, because 199904261 - 2⁶ = 199904197 is a prime.

It is a super-2 number, since 2×199904261² = 79923427131912242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199994261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99952130 + 99952131.

It is an arithmetic number, because the mean of its divisors is an integer number (99952131).

Almost surely, 2^199904261 is an apocalyptic number.

It is an amenable number.

199904261 is a deficient number, since it is larger than the sum of its proper divisors (1).

199904261 is an equidigital number, since it uses as much as digits as its factorization.

199904261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 199904261 is about 14138.7503337459. The cubic root of 199904261 is about 584.7102185709.

The spelling of 199904261 in words is "one hundred ninety-nine million, nine hundred four thousand, two hundred sixty-one".