199630261 has 2 divisors, whose sum is σ = 199630262. Its totient is φ = 199630260.

The previous prime is 199630219. The next prime is 199630267. The reversal of 199630261 is 162036991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181737361 + 17892900 = 13481^2 + 4230^2 .

It is an emirp because it is prime and its reverse (162036991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199630261 - 2²⁵ = 166075829 is a prime.

It is a super-2 number, since 2×199630261² = 79704482213856242, 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 199630261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199630267) 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, 99815130 + 99815131.

It is an arithmetic number, because the mean of its divisors is an integer number (99815131).

Almost surely, 2^199630261 is an apocalyptic number.

It is an amenable number.

199630261 is a deficient number, since it is larger than the sum of its proper divisors (1).

199630261 is an equidigital number, since it uses as much as digits as its factorization.

199630261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 199630261 is about 14129.0573287817. The cubic root of 199630261 is about 584.4429508752.

The spelling of 199630261 in words is "one hundred ninety-nine million, six hundred thirty thousand, two hundred sixty-one".