199055551 has 2 divisors, whose sum is σ = 199055552. Its totient is φ = 199055550.

The previous prime is 199055537. The next prime is 199055581. The reversal of 199055551 is 155550991.

It is a weak prime.

It is an emirp because it is prime and its reverse (155550991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199055551 - 2¹⁵ = 199022783 is a prime.

It is a super-2 number, since 2×199055551² = 79246224767827202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199055581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99527775 + 99527776.

It is an arithmetic number, because the mean of its divisors is an integer number (99527776).

Almost surely, 2^199055551 is an apocalyptic number.

199055551 is a deficient number, since it is larger than the sum of its proper divisors (1).

199055551 is an equidigital number, since it uses as much as digits as its factorization.

199055551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50625, while the sum is 40.

The square root of 199055551 is about 14108.7047952674. The cubic root of 199055551 is about 583.8815662991.

The spelling of 199055551 in words is "one hundred ninety-nine million, fifty-five thousand, five hundred fifty-one".