1998974671 has 2 divisors, whose sum is σ = 1998974672. Its totient is φ = 1998974670.

The previous prime is 1998974657. The next prime is 1998974687. The reversal of 1998974671 is 1764798991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998974671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998974641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999487335 + 999487336.

It is an arithmetic number, because the mean of its divisors is an integer number (999487336).

Almost surely, 2^1998974671 is an apocalyptic number.

1998974671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998974671 is an equidigital number, since it uses as much as digits as its factorization.

1998974671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 61.

The square root of 1998974671 is about 44709.8945536668. The cubic root of 1998974671 is about 1259.7057074929.

The spelling of 1998974671 in words is "one billion, nine hundred ninety-eight million, nine hundred seventy-four thousand, six hundred seventy-one".