4198891 has 2 divisors, whose sum is σ = 4198892. Its totient is φ = 4198890.

The previous prime is 4198889. The next prime is 4198921. The reversal of 4198891 is 1988914.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4198891 - 2¹ = 4198889 is a prime.

Together with 4198889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4199891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2099445 + 2099446.

It is an arithmetic number, because the mean of its divisors is an integer number (2099446).

Almost surely, 2^4198891 is an apocalyptic number.

4198891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4198891 is an equidigital number, since it uses as much as digits as its factorization.

4198891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 40.

The square root of 4198891 is about 2049.1195670336. The cubic root of 4198891 is about 161.3286626193.

The spelling of 4198891 in words is "four million, one hundred ninety-eight thousand, eight hundred ninety-one".