198707891 has 2 divisors, whose sum is σ = 198707892. Its totient is φ = 198707890.

The previous prime is 198707857. The next prime is 198707911.

198707891 is nontrivially palindromic in base 10.

198707891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 198707891 - 2²² = 194513587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198707801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99353945 + 99353946.

It is an arithmetic number, because the mean of its divisors is an integer number (99353946).

Almost surely, 2^198707891 is an apocalyptic number.

198707891 is a deficient number, since it is larger than the sum of its proper divisors (1).

198707891 is an equidigital number, since it uses as much as digits as its factorization.

198707891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 50.

The square root of 198707891 is about 14096.3786484331. The cubic root of 198707891 is about 583.5414425537.

The spelling of 198707891 in words is "one hundred ninety-eight million, seven hundred seven thousand, eight hundred ninety-one".