19842271 has 2 divisors, whose sum is σ = 19842272. Its totient is φ = 19842270.

The previous prime is 19842269. The next prime is 19842313. The reversal of 19842271 is 17224891.

It is a weak prime.

It is an emirp because it is prime and its reverse (17224891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19842271 - 2¹ = 19842269 is a prime.

Together with 19842269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19842241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9921135 + 9921136.

It is an arithmetic number, because the mean of its divisors is an integer number (9921136).

Almost surely, 2^19842271 is an apocalyptic number.

19842271 is a deficient number, since it is larger than the sum of its proper divisors (1).

19842271 is an equidigital number, since it uses as much as digits as its factorization.

19842271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 19842271 is about 4454.4664102449. The cubic root of 19842271 is about 270.7263069238.

The spelling of 19842271 in words is "nineteen million, eight hundred forty-two thousand, two hundred seventy-one".