199995949 has 2 divisors, whose sum is σ = 199995950. Its totient is φ = 199995948.

The previous prime is 199995941. The next prime is 199995953. The reversal of 199995949 is 949599991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 65853225 = 11582^2 + 8115^2 .

It is a cyclic number.

It is not a de Polignac number, because 199995949 - 2³ = 199995941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199995941) 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, 99997974 + 99997975.

It is an arithmetic number, because the mean of its divisors is an integer number (99997975).

Almost surely, 2^199995949 is an apocalyptic number.

It is an amenable number.

199995949 is a deficient number, since it is larger than the sum of its proper divisors (1).

199995949 is an equidigital number, since it uses as much as digits as its factorization.

199995949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10628820, while the sum is 64.

The square root of 199995949 is about 14141.9923985272. The cubic root of 199995949 is about 584.7995992173.

The spelling of 199995949 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred forty-nine".