1984198871 has 2 divisors, whose sum is σ = 1984198872. Its totient is φ = 1984198870.

The previous prime is 1984198849. The next prime is 1984198897. The reversal of 1984198871 is 1788914891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1984198871 - 2¹⁰ = 1984197847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984198171) 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, 992099435 + 992099436.

It is an arithmetic number, because the mean of its divisors is an integer number (992099436).

Almost surely, 2^1984198871 is an apocalyptic number.

1984198871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984198871 is an equidigital number, since it uses as much as digits as its factorization.

1984198871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 56.

The square root of 1984198871 is about 44544.3472395769. The cubic root of 1984198871 is about 1256.5942440640.

The spelling of 1984198871 in words is "one billion, nine hundred eighty-four million, one hundred ninety-eight thousand, eight hundred seventy-one".