8201891 has 2 divisors, whose sum is σ = 8201892. Its totient is φ = 8201890.

The previous prime is 8201881. The next prime is 8201903. The reversal of 8201891 is 1981028.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8201891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8201801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100945 + 4100946.

It is an arithmetic number, because the mean of its divisors is an integer number (4100946).

Almost surely, 2^8201891 is an apocalyptic number.

8201891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8201891 is an equidigital number, since it uses as much as digits as its factorization.

8201891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 8201891 is about 2863.8943765439. The cubic root of 8201891 is about 201.6684673776.

The spelling of 8201891 in words is "eight million, two hundred one thousand, eight hundred ninety-one".