198796891 has 2 divisors, whose sum is σ = 198796892. Its totient is φ = 198796890.

The previous prime is 198796877. The next prime is 198796931. The reversal of 198796891 is 198697891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198796891 - 2⁵ = 198796859 is a prime.

It is not a weakly prime, because it can be changed into another prime (198796391) 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, 99398445 + 99398446.

It is an arithmetic number, because the mean of its divisors is an integer number (99398446).

Almost surely, 2^198796891 is an apocalyptic number.

198796891 is a deficient number, since it is larger than the sum of its proper divisors (1).

198796891 is an equidigital number, since it uses as much as digits as its factorization.

198796891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 58.

The square root of 198796891 is about 14099.5351341808. The cubic root of 198796891 is about 583.6285510495.

The spelling of 198796891 in words is "one hundred ninety-eight million, seven hundred ninety-six thousand, eight hundred ninety-one".