19988671 has 2 divisors, whose sum is σ = 19988672. Its totient is φ = 19988670.

The previous prime is 19988653. The next prime is 19988681. The reversal of 19988671 is 17688991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19988671 - 2⁷ = 19988543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19988681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994335 + 9994336.

It is an arithmetic number, because the mean of its divisors is an integer number (9994336).

Almost surely, 2^19988671 is an apocalyptic number.

19988671 is a deficient number, since it is larger than the sum of its proper divisors (1).

19988671 is an equidigital number, since it uses as much as digits as its factorization.

19988671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 49.

The square root of 19988671 is about 4470.8691548736. The cubic root of 19988671 is about 271.3904992504.

The spelling of 19988671 in words is "nineteen million, nine hundred eighty-eight thousand, six hundred seventy-one".