199055897 has 2 divisors, whose sum is σ = 199055898. Its totient is φ = 199055896.

The previous prime is 199055851. The next prime is 199055933. The reversal of 199055897 is 798550991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146797456 + 52258441 = 12116^2 + 7229^2 .

It is a cyclic number.

It is not a de Polignac number, because 199055897 - 2⁶ = 199055833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199055827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99527948 + 99527949.

It is an arithmetic number, because the mean of its divisors is an integer number (99527949).

Almost surely, 2^199055897 is an apocalyptic number.

It is an amenable number.

199055897 is a deficient number, since it is larger than the sum of its proper divisors (1).

199055897 is an equidigital number, since it uses as much as digits as its factorization.

199055897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 53.

The square root of 199055897 is about 14108.7170571955. The cubic root of 199055897 is about 583.8819046015.

The spelling of 199055897 in words is "one hundred ninety-nine million, fifty-five thousand, eight hundred ninety-seven".